Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e75a9b4bcee0d4…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 02:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad372ff9c243e4744caa4a14d3ac20d5 SHA-1: 30f3eb8cb37b4043c36f47b49719c3ce20a3917d SHA-256: d7e75a9b4bcee0d4426c4d83ec416b6c09de03314506ccad62aa68e68f2e8bdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607840097f2d2---53321232957.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b3f9d01984e227ee916e3961815f61bd/64095854715.pdf
    • https://ludifrance.fr/userfiles/file/46241182116.pdf
    • http://katachizu.com/img/news/files/newasogiwexarufozilud.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b89589751---64236731035.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c15f376a---ritesitafeguboxeteluw.pdf
    • https://deniz-sogutma.org/img/userfiles/file/tekowevisemudepiromulo.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d11078180---garadomatirazazetasuz.pdf
    • https://uppersanduskyrotary.com/cms/files/File/linikoro.pdf
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/22598293971.pdf
    • http://atomleasing.ru/media/File/76161647043.pdf
    • http://chapelguild.com/images/usr/5558161742.pdf
    • http://portalcom-b2b.es/img/user///file/_0482711001620320837.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/vajuridojixobagonevo.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3b25b95b6037440eaf7647cefab5a701/didabilojudazu.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc49e8ca1---33561810689.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7eh8n841gndf26cdsi68i0e5f4/siwajumijigekaruvofav.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c9cb0e255---90740516202.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/68353711201.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/suxezugapeji.pdf
    • http://kibbkw.com/uploads/file/23811510013.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/j1at87q4ttf2ior8br5ik01pl9/84038985377.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e94fab41721578578f63169159bd1e15/73614556109.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a27633358bd---porofajulu.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nvssbm16rnrth68f0e6jg6cktr/91661145015.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=750+million+mosquitoes
    • 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_off0000f6b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 16792 bytes
font_01_sfnt_off00010ec3.bin
2085eab9cfbcd68a8e5ab2e01eb2aeac3c4d453f2d9314f61139ce605981a438
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 16780 bytes
font_02_sfnt_off00013a74.bin
a073c64fff49925e2a9ecf2061d2cb166d9f8fa5d882da814ed29dbbba9a8bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 10460 bytes