Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a32a7053d84b5f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 08:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0b6484f888392efd257bb3d5dca6d17 SHA-1: 8db5ccc9ce63ace26f32842783f58d2e5978f85a SHA-256: 85a32a7053d84b5f04d8d54bcc3d268209c105ab74c54e912afe917d7bd41a57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://reformedgeneration.com/userfiles/file/58482706147.pdf In PDF document text
    • http://manhtreminhduc.com/webroot/img/files/vakifapisakofokos.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/31b9d9828835ce0477e7884c2ef94849/sigejek.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a7422ecc0d078a4dce51bed406850891/64990569710.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dh5au7bjq9505j9nu2gprpdpbv/gilubixani.pdfIn PDF document text
    • https://bdata.vn/upload/files/zatubosazabijorut.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/19546981545.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/85197161268.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/jidilukesixozugo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/xovubizidedetumaxibep.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/52840780736.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353423a5300---27058810118.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/22675212652.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/zafivomesuzo.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/5646860143.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/suposiruwigodekaba.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/jofavedimupetenijivif.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/xokumuguxukabugit.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/51179451082.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/lulox.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/86828357521.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/51142575451.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/21471521844.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/93436952147.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/detorogo.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/26419761307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=film+editing+software+for+androidPDF 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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 10760 bytes
SHA-256: cf76cc2ba1128af3bd9dd23040dfb16928cab4fec4e3fece14b7800763df1330
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 17048 bytes
SHA-256: 1d3109e392b87f4c616b03deddde6d3c3983cd7460e7c3a98afb8f681cad63ce
font_02_sfnt_off000122c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1