Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5295e333eb46b3…

MALICIOUS

PDF

87.6 KB Created: 2021-09-14 06:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efad39cb0bbe45ab34fcb2481dbaa887 SHA-1: 94d3fde4c7a28c7bf6ce63dff59522fa7d26aa27 SHA-256: 8f5295e333eb46b387ffab195a6537eada0205afebf67ebdeff1e8fa83ae0968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://pixomot.ru/uplcv?utm_term=streaming+film+oldboy PDF link annotation
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/99109359578.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xaxamoke.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/7764971442.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/47243115845.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/wavawisirobozo.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/50218388263.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/wogidemewif.pdfIn PDF document text
    • http://djpress.pl/Image/files/turenunuveliwavuworuto.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/nazovukogofogudu.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/muzukedifujevelekimaxur.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/nusifemazikobutifo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9f9761c506020e318f7c9a6a2a44d92a/jesujavib.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/gerixalol.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/13914073091.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924a497597---38418746963.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d88a9593b0---92368748084.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/lulipufumuzafefuseba.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/serijenabijoze.pdfIn PDF document text
    • http://e-sportis.com/images/upload/jililisokowujefuzaposiwu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a95c8dc04---sulimidapudufe.pdfIn PDF document text
    • http://immopolignano.lu/images/karajaxibubadikevanena.pdfIn PDF document text
    • http://drironcat.com/images/file/7558315505.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/55321316327.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/85903570973.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/39643439525.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_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 10856 bytes
SHA-256: fec9759faf2b0319edff8a52f343896fbbdebed493ea4214009fde4139934d67
font_01_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 18044 bytes
SHA-256: 8edeb6863784c736190ce1db3d5adc3b6e238db2a6a2ba229534a1c02f0772ec
font_02_sfnt_off0001389d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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