Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8ad2b5f876b145…

MALICIOUS

PDF

81.1 KB Created: 2021-08-31 04:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f379fcf765d919e8c15e2390ad8f6f64 SHA-1: e7b13a8fde2dd15d24133b1e4ec321245c9e2d15 SHA-256: 8c8ad2b5f876b145120fa720c7a109a77f63562983e75141631381366ff8db54
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the extensive use of external URLs suggests a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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 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 https://pixomot.ru/uplcv?utm_term=do+you+italicize+a+quote+in+an+essay
    • http://stainless-faucet.com/uploads/htmlupload/files/vusisuxepalumalafaj.pdf
    • http://abwingsbuffalo.com/uploads/files/11236077871.pdf
    • https://mumegram.com/userfiles/file/40778772113.pdf
    • http://ketoanaca.com/uploads/image/files/maziriroxapatuguz.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/magus.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ef5e338bf638d5fabafdb09d6cc80cea/70725641177.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c411680c81945a96579309d0a6891cf8/giwarezovinapijamon.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d03a491b---46436461223.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dd6cf21c7---lowonefuk.pdf
    • http://zhongyuemedia.com/filespath/files/20210831051400.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf872723b2---31747756484.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87e76a15e---64677507529.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d1f826dcf94becc2c4c022b07ebc8afd/nomukojedewugelelojo.pdf
    • https://artbynela.com/uploads/file/vojakubarekutuxikas.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c0ee79df---90645696805.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a824c8b1d6---90085990011.pdf
    • http://mistral-paints.cz/userfiles/files/lepukosuzomal.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/uj6qjlqcta1dsao6b4ecc4cu1r/65471338846.pdf
    • http://krzeptowski.pl/file/6160150354.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ed08e4d136785143ec8f21b5907c17af/pobutukiwuzotibabeki.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sg0pnr2odnqfa11d0nhlobehq4/54223124398.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b825a9c818---zekamagekuxuxozanoz.pdf
    • http://cnkls.com/userfiles/file/1625888150.pdf
    • https://masukpt2.com/contents//files/75226198124.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6ea14609a---34625760495.pdf
    • http://allycatering.com/userfiles/51687433261.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9089203ee6---jinonefuxij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db75.bin
6f4a27b4d1eee619d0517de2bc7284dcb48db07c300c1730bab5a12a0239a0b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 10544 bytes
font_01_sfnt_off0000f3b9.bin
bb4a2c397b15218b23c29109d2adc389d6bfad45ed233cd43772d86c8ea3e638
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16764 bytes
font_02_sfnt_off00011ebc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16792 bytes