Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec40f17ec1cb54b4…

MALICIOUS

PDF

70.0 KB Created: 2021-09-14 14:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e903bf6a028b54e429d6965e34853d6a SHA-1: 6ba2f33c4183ce755c464e16dce95a8b3dd82e40 SHA-256: ec40f17ec1cb54b49d2a81f961c918b3ee5e38add45be7f38cbfc5eddfb9982b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614029187057c---wanixamuwitajikedovudeb.pdf In PDF document text
    • http://virus-safe-zone.com/ckupload/files/91772288378.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/nenoluvidutan.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161308d727cb28---15928388003.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/lideselujawafuxe.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/dudobugobitigiximafetosi.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/pavemu.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/lizadanadipibafinolel.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210902180154_1411573424.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/5792544134.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6131838d750ba.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/rizeg.pdfIn PDF document text
    • https://jss-moms.si/upload/File/98917394378.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a0597f5c---23323719279.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/bowebosesulavofadedin.pdfIn PDF document text
    • http://vaynhe.com/upload/files/58922375894.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/88144186075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hanuman+chalisa+in+word+formatPDF 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_off0000ab82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB82 18144 bytes
SHA-256: 652195b4bdeccda185c666bc6c239e94e048c7efa5218070d7ad9199c1466ed7
font_01_sfnt_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 10788 bytes
SHA-256: 82a76d022617904a3e6d0c300c671316631580c2c21bc077685572d6d578a1a7
font_02_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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