Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dd0d0b54861e33…

MALICIOUS

PDF

94.1 KB Created: 2021-09-03 20:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f79ab6547b5fbc036691cc6fe858d98 SHA-1: 3ee27a2c916eec244cab51dedb19766174dbd3e7 SHA-256: 25dd0d0b54861e33486896f179b4cefa0b4eb6442c2ff2f7d6e107b026560b3c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links, many of which point to compromised WordPress uploads and disposable hosting. This suggests the document is designed to act as a lure, directing users to potentially malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891ea46f0cb---97280683421.pdf In PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/rimedogovanozobonodesesak.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd282e5025c---sopijesore.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/27552374209.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/gitezurejakaxi.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/leluruj.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/92327943783.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e2ed1484---1194998052.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e4686c467c91eff162a202262f3c42c/misaf.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/51693257059.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9kd6k5c1252c4jrj1tmdhph23l/41729709005.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/favinomo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127284baf3f6---71140710331.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c217cb07c---83977584694.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fned8ngnil9s8fbrr8b76p36g5/towavipusunusovitolivik.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mokurexarop.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00ded6ddb---35664453384.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2e9edf22---56211200390.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/kumazuwufulujugapifaroro.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e9c2f0cbc---30551152830.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/81j81k2rkadrmsr3lb9vogukg9/joxarum.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1d2cd68f271644671fc7798d6b9b5d16/tefokonunew.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/8778374956.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/15338070727.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becbc36cef1---felosuroxuzizul.pdfIn PDF document text
    • http://someteme.com/archivos/_20210802090050.pdfIn PDF document text
    • https://actor-conseil.com/files/file/7268008130.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/liromixujuzutotawepikab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=causes+of+rangeland+degradation+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10804 bytes
SHA-256: b40a318ff174e2441605f0603ddcb66f3d393e885658548049412d3adf51e051
font_01_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 17152 bytes
SHA-256: 52d77a3a13a5c1d5baaf4d26af8eef1fd7e911383ee2707e6df919350f12aed0
font_02_sfnt_off0001523f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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