Malicious PDF — malware analysis report

Static analysis result for SHA-256 acac28dffb47e881…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 07:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdaf3f452f420fb2bb93d1f926c193f1 SHA-1: 74ebe3fcd57ec00d029a0d1bb3a8853b312d048e SHA-256: acac28dffb47e881c55126d19e2a915a4ec99063fae31a55ab5a6c6db9540f82
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These links likely lead to phishing sites or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ambvetfanini.eu/userfiles/files/vivofabis.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c5ff3a4329c83555708c95e814d31e3d/fatijexim.pdf
    • https://mundolibre.cl/uploads/userfiles/files/15026732639.pdf
    • http://cafemsoffice.com/userfiles/files/63134176755.pdf
    • https://pierrelemagicien.com/userfiles/file/87609136623.pdf
    • http://kidzcastleschool.com/singhania/downloads/file/bakamurivepuletoni.pdf
    • http://lepetitjaunais.com/userfiles/file/zobabupeduwivakixome.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/lafidiwu.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f155078323---97446998698.pdf
    • http://aquaclub.hu/userfiles/file/pefugo.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/6496417344.pdf
    • http://thebrownbag.vn/upload/files/nupuvanigesobanonowi.pdf
    • http://av-jet.ru/userfiles/file/57838148218.pdf
    • http://imhkayseri.com/resimler/files/44241566895.pdf
    • http://jingluo.net/uploadfiles/files/ponuvafisuzefoxubulufimo.pdf
    • http://registermycompany.in/admin/userfiles/file/93044952973.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/pumipukavod.pdf
    • http://jszl-rolls.com/filespath/files/20210912121159.pdf
    • http://conblocmanado.com/pics/file/jegibezagug.pdf
    • http://world-green-hope.com/uploads/files/76293373169.pdf
    • http://a2hgghk.handylover.com/upload/files/48788516254.pdf
    • https://chongtham68.com/app/webroot/uploads/files/lajakikoz.pdf
    • http://szyoujin.com/UploadFile/file/20210908142713376.pdf
    • http://reflita.lt/uploads/files/witep.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/go3k2ho59v706j9i3pi1rhsct5/20800101435.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=seeing+444+biblical+meaning
    • 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_off0000c2f8.bin
f45dd3824f6df3c2ea42a2fcb70a2fa6737836a20f4844a7d5d21e49d06a1f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 10380 bytes
font_01_sfnt_off0000da74.bin
b5593386fb1be33e851d63c558a7b0c4a71dbee3cb84871f9474d31fa5ff6ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 17416 bytes
font_02_sfnt_off000107bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 16792 bytes

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