Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a2afa83c7a2de1…

MALICIOUS

PDF

207.4 KB Created: 2021-06-21 19:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0809498eaa65c039ee278c95047ca268 SHA-1: 38ad1de69672a4ed70a463e596a64e597b00de8c SHA-256: 75a2afa83c7a2de164900b4f2c3215e8ed25e1810ec2d8fc30236c99731a009a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4bea6bc6---tenomikatatajepizopilive.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4250f1fbb---pebededajidijikasonib.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160983e2da47d2---zaperexonokepefi.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/58160513741.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/44nfqh6mdijkmb56a8cr69vu8o/numoxawepuvadawomagusite.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/76904369383.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/mutiq9k7lob6o2t9r1babp3kk4/xirev.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/talogimuvunijifosibuwevun.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/13772066847.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbdfa27ec7fe55e6ae51586ba203398e/65410590817.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6c216a82cc0aa4f4d0d36c48efdee61b/namutobijudekewonamaw.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160913210cb485---bolifimuxekugojo.pdfIn PDF document text
    • http://altinay-law.com/images/file/2096174203.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7a1bed23---wugupew.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/31330275047.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/83312829491.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/57d3c1d7d26c037ac3eb3a2ac0ae6772/towegemizijutosofifuneni.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ffufj18tma43ptehlal5eic1c4/32834174639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=latest+ielts+academic+reading+test+2020PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F62C 5476 bytes
SHA-256: 4f466ea4dc5dcd90b8accdb5b436c05f9ef8b64c66da4b74356fc50e2d825a3f
font_01_sfnt_off000308b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308B1 11172 bytes
SHA-256: 08424bcd0a3c4c587c97023f5b7804b6962ee11bd2a19e7b13bbd24187bbdb77