Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d56de6762c0186…

MALICIOUS

PDF

94.3 KB Created: 2021-09-24 00:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1434f0dc395515125eec0bdbad1a9d53 SHA-1: fdb3aaa6941fb1192588ab364fcc0cbdadff60dc SHA-256: 85d56de6762c01866e2db6cb1c5685149051f9a54618b915a1fe42b71344b512
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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=henry+miller+to+paint+is+to+love+again+pdf PDF link annotation
    • http://vector-mebel.ru/uploads/files/damokelagopomo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ea1b6fa7a18f1a5c570dbcb44e9be364/xedowix.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d20cdec1d098be99103a1b3a281d10ea/25283823171.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/64018220063.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/77405204211.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345d62794c9---rifuzabijafazidemavadino.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/53882872833.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/baralejatixebirov.pdfIn PDF document text
    • http://teplospectr.ru/images/files/wunopubuvurorerexo.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/dozugawegojekekol.pdfIn PDF document text
    • http://dnepropress.net/files/file/83902574726.pdfIn PDF document text
    • http://vodnik48.ru/content/file/dazaza.pdfIn PDF document text
    • http://getem.pl/files/file/mipalosusi.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dff6ad64dd653c9a2900b78a9fed17cd/75544824918.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36b720871---gisagaparisisarin.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/mavudo.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/7614940565.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/razirafor.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/bovozawef.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/106670697361451bffb361e.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/bosabuporulutageb.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/pisujonazaguxiw.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/rutonogepuvulixudugezafaj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 11012 bytes
SHA-256: a840048e6196a4b7db9741decdecad9af86db0a1f0fa67c49ed838f47cd62cb2
font_01_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 19052 bytes
SHA-256: 84c517d7fd31543bc7cb0d171d11f987581a0565f7edc12c8bd8c968d52310b5
font_02_sfnt_off00015304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1