Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd693281cb32b663…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 06:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95742c96d49e2a46c03086003ecb0422 SHA-1: 8abc3f2a539157d0c5a708fbcf6819590fd93bbe SHA-256: bd693281cb32b6636a2f9bb18413a78bccd9830adcbf082501e00f44bc1e9f7a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://nadiadsa.org/userfiles/file/49794569595.pdf In PDF document text
    • https://renebeumer.nl/userfiles/file/9687052578.pdfIn PDF document text
    • http://punaide.com/userfiles/files/fuzebafuxitesogomiri.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/venamofuxutej.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161372a9dd1531---lofikamezavinufu.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/wowigupebabelekiniponifo.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///10633273434.pdfIn PDF document text
    • http://happy-land.hu/editor_up/85113626475.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/9417471092.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/u8fgogmjldiokt0ju079vivkeo/85948328597.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/91190402308.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/18768437613.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/61172733486.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/diranufun.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb9944bb7---14002432826.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422bcc4d845---wenufanetarotodamuf.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/muveja.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/49588020237.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/lodejexugijuwedipuwofasab.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/jibosuraboxani.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/78909262625.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16319961009380.pdfIn PDF document text
    • https://flomogroup.com/upload/files/suvovatetomelorugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ninja+samurai+assassin+hero+4+mod+apkPDF 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_off0000b8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F1 16616 bytes
SHA-256: b0744ac77365ed393aea1d91a16a8981d0c06378b73f27cecf068718d973db67
font_01_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 10892 bytes
SHA-256: 5dd46bbe25873e67534a459cb6a07d6725bb483d445ab432312d81b25717cc23
font_02_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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