Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c6eff610b3239b…

MALICIOUS

PDF

90.3 KB Created: 2021-06-28 22:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09966d9963d55ff1ae59c6de8411e1e2 SHA-1: 6dc7dc01a44502da8648cc0d7131f0d1d84dbe56 SHA-256: 93c6eff610b3239b5c09492860792cdd1494341b2ba9a9b14b99813af9d625e8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

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 http://computer-rudolstadt.de/upload/file/wuzolelokibifugalajov.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076231cae222---tolivexomalisugi.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/18929c9594cd61f9227bd29e6f25ded8/90102049217.pdf
    • http://wenxuezj.com/images/File/fakedakima.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160964f74562d4---rowivagalizotilenunixadov.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f066bb327d---jugasonu.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ba6cce91e77d67a2822f1e4997b92528/jagikek.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/1e6e6fc3812bb761103141919c45af6a/kalidi.pdf
    • https://tectrongim.com/uploads/files/pisanekiditizem.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61c36253da---23866389364.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c140658048---48309764717.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d945fcc9cbb---jesoxufozawemavesuvelo.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6672cbfb9280e8198b2203f48798ae71/59726352251.pdf
    • http://sns.hu/_user/file/lodutoxalipu.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d006fdb3---melifamerufipa.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/tofubiwanozol.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57e11f732---55375361721.pdf
    • http://clairvoyantinfotech.com/demo/images/piratonetemesefepife.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxofotexewilajefijowulu.pdf
    • https://airshow-bg.com/file/90167012347.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160836b01e81e4---17893320035.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3c9511bd---31082256089.pdf
    • https://motelandratecuci.ro/userfiles/file/62303833394.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/midabakip.pdf
    • http://adveotec.com/img/file/50229130767.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=self+employed+sole+trader
    • 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_off0000fd0a.bin
5c114252fed90d313461e86ef89524fdaf6321e2927274ea7023f1c3a9c777bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 10652 bytes
font_01_sfnt_off00011580.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 16792 bytes
font_02_sfnt_off00012d92.bin
f88a035a0bbf4fc3270888619f8d3345c6e9d89e81f3bd62edbf380f1d40b53c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 17648 bytes