Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2052936235a5a5d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-24 14:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d550ea9a184f8fd0c7781c06a4551437 SHA-1: c3d79338e158085b59a60d8522bc3eb5fa3222d0 SHA-256: a2052936235a5a5d7bcd775170bb0fae928404d961d2343c4721e2ce10175f50
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to compromised WordPress sites hosting other PDF files. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • 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://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3e5061d28---sanafemagebusipiwumus.pdf In PDF document text
    • https://leo.tw/upload/ckeditor/files/wejel.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161373916408b6---buxejinepu.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/28785231915.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6ja51u3n5dk9caolv4ssmqkgi3/64525764430.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/51424027671.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/savajekajesugegesivageda.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/76459100521.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/14815534567.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/39082039990.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/vinesosinufiz.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/82200442358.pdfIn PDF document text
    • https://majubesar.info/contents/files/wemezanudixoxagabatolewup.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/lapujo.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/jujitijimobug.pdfIn PDF document text
    • http://feg.vn/uploads/files/jaxorisigupiba.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/93112101582.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/zumubad.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/kizimofina.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/87201802602.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/31921350561.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/065b0c6eb107a9ea4ccbc7d4e24bd976/58439250632.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/fajavu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/reberutolata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=happy+guts+racing+glory+wheelsPDF 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_off0000c157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC157 10944 bytes
SHA-256: d402bc3014481ad7e341cb3086fd10669c82b715b0149f1362dfbe2a78125890
font_01_sfnt_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 18884 bytes
SHA-256: e75956d5cce162d8a10de5f4df22b2145cef2051c63a69e4353c83739fc1ffae

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