Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64303b987c17879…

MALICIOUS

PDF

85.8 KB Created: 2021-07-07 06:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b19a3b394f2f041fce6fb1546e714a3a SHA-1: 1aaffc61e9b5d66487fce8888152dafed0b6e606 SHA-256: c64303b987c178796b08d73940ad0951f2fa1d70b69ef8486977bcb5d0e20b73
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to redirect users to malicious sites for phishing or malware delivery.

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 https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/cd0faadc36298b0c824afe82b2149a13/gomibunesujawijizagadode.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ab213ef1496b61f7e63dad7e133e2f69/84655806461.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/8a5a6ad437b27dadcf957dae0e762027/xolikukukajasilo.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b55e0f21174---56292556479.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095300c4dd8f---dibulijufa.pdf
    • https://advantagelic.com/singhania/downloads/file/wusotedabitapopugale.pdf
    • http://ankaser.com/userfiles/file/nilewofobigelezexujusakuw.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b79b94be130---linagotudin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943755911d1---98899994528.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e6fcdcde8c147869a6c46cfea0aced58/23446320491.pdf
    • http://flagrant-desir.com/userfiles/file/daduvakitataje.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/613124e95b5ca81b1855d2a224c5a6ab/3946874165.pdf
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/pumenokurelosokimigup.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b64f2e22cddc7a557cf26ca35ecd2366/girew.pdf
    • https://101doctor.com/uploads/ckfiles/files/60ceae7f993bb.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093a73d134d0---wolorovoji.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f8955e1e5b5669f9d438900564123b6c/musiroxe.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7b460cc8---kivebavoviputukudul.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a8b4696e318b39fac874fd745fa832b5/23472977930.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085485089c72---94896782758.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/gorajuniziwano.pdf
    • https://nadamasristorante.it/file/9204224689.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087abe849999---36855573448.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07fa529fe1---xoritun.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=world+polluted+city
    • 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_off0000ede0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 16792 bytes
font_01_sfnt_off000105f7.bin
69ead8f70b0440225ee50f0d6e2eed9e453cf01500b9c2f7dc127ef3642115ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 10280 bytes
font_02_sfnt_off00011d32.bin
0efbb18cfbfe86ce5c33a75af7704544d96671be477f5a42b387c34a46b3ce2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 17384 bytes