Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77fbe9154073176…

MALICIOUS

PDF

88.6 KB Created: 2021-07-13 11:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1aa55d72ce56c2545e82a75186fbd31f SHA-1: 6726d15595da349dd36572dd22eeffacd9cb7288 SHA-256: b77fbe91540731766705cdef90f5b6722364b24bd2ae7722c05362fc4aedc839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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://suamayin.biz/userfiles/file/923563803.pdf In PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97b7de0ff---rakagowaxitowudisezuwezes.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/31424657146.pdfIn PDF document text
    • http://roocenter.ru/upload/file/19896980706.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/variw.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098332a12fcf---kodebilu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1av5bo7vot4ct9v2bd53494u9q/binepo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/62a978978db2942fc2039301b134350c/83565207345.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9f43e2c93eb8c4ba70436f66ee8af4e3/75555514222.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/verizofowuzodekosu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c920ffbef57eb4db5fbf9d967161e614/13469799468.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/kiniweti.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/50435993418.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de94480870---66721661945.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/94113266187.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/59407713924.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/11699559938.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b9f6d49b---nefata.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd8c4286b---31913013283.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/33455594937.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f0b54c0703794e3f855204e63b1067fc/41443145501.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/zoponuxefodufapero.pdfIn PDF document text
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/19357440811.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/vetox.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gavodugalegegajituf.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ea374953---fazinorunim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=i+with+accent+in+spanishPDF 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_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 18684 bytes
SHA-256: ad9474e7d53b46f89ab1d6ce104a068d5302424d796e27a48dce45b912bdbbd5
font_01_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 10240 bytes
SHA-256: 171ee0cfc9280f07fff059897636bef72d4097f3df2d9e5584cbc030b4bc4432
font_02_sfnt_off00013d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1