Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d7914870bf95dc…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 13:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 113a65b43a5cfc19eadacc30a4177cfc SHA-1: 9027b0762a66da44c716c1f1f8add86a7b1250ee SHA-256: 67d7914870bf95dc21070cee3cd70b52a43bf2c949321c4ce458ea7ac2366d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/855997ca54214bffc94397d67b83d4a9/jofulu.pdf In PDF document text
    • http://libron.pl/fckupload/assets/file/25705729353.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/70614293828.pdfIn PDF document text
    • http://palami.by/images/file/bajuwalupezaba.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210915_D790813C0F75D764.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439e57d312---3210061815.pdfIn PDF document text
    • https://renetravel.ro/images/files/1282070915.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/17236999989.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161330db95d848---27036068383.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/dimilekujovujetibadip.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d854a5911---nedevaritimife.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613442a8ee5ea---51382220627.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/98865908154.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/56590393016.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1c17eb6a---9734675207.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/mazala.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/raxefawipoburexoxi.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/vemewanetukevome.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/13366487348.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/vazevotivudeka.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/16199430854.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/59713574853.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/54666429785.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/80546919100.pdfIn PDF document text
    • http://recviem.ru/img/upload/pagasimamegegivoparoxagix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hide+online+hack+apk+unlimited+moneyPDF link annotation
    • 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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 10808 bytes
SHA-256: a6a989b380a6422701292fa1a9b678726402127814ea785f8dc2b83662ada6ef
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 18100 bytes
SHA-256: b9f5e015148d54949163d45a7209f4608215c657844aebd463f148332a737b4c
font_02_sfnt_off00012fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1