Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df4b26d58a2870d…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 07:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7255b44e101611dcf40b4bbe66b0a479 SHA-1: 8d388bb49435995feb452cb1d353746151f90bca SHA-256: 1df4b26d58a2870d60225c4fca9565fc7203fbaacfb92936bb521826f299bfa3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, many of which are hosted on WordPress installations and point to files within plugin upload directories. These links likely serve as a lure to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a58e2f29760---ladudiwel.pdf In PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/21869935432.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afabf70b75b---sivejidubosozoxavuvido.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f8a47b85---noreparabuvurezasomevuxon.pdfPDF link annotation
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/411c4d1141db36794778427a7b5a57b7/nakupavemilusutumaxef.pdfIn PDF document text
    • https://paperland.bg/uploads/file/mukikarozakazan.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16238514050972.pdfIn PDF document text
    • http://e-sportis.com/images/upload/jafusuno.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/60877987245.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d1e726f5f---miminibugitowiwelafez.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160add362c5238---13955657426.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fasutos.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/601cc8ec7941e6abe0cdd3390a557df6/didewotomojazadoligu.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/76549607945.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/094dd9f435b6b3d2c3f8fcceb1129b01/vojawopejevola.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0e2d5311---xubibikenuzajomezad.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/75519324475.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491ff44484---sedegodaj.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/49909555616.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845da99cd46---ruzelafuvaju.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/xusarotemepekoxase.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/55200855810.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/83a9ea142c010a50fffa8bd0155a3f33/xifuwapefivigonoje.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c82183858---gusikulefabuvopejowukeso.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/gasasolisevipaxamaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=femoral+popliteal+bypass+postoperative+complicationsPDF 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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 17424 bytes
SHA-256: aa35ffbd613c5c2f6649f132bc258facda089832c7cdcddc833d67e1e6391488
font_01_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 10832 bytes
SHA-256: d3415dd01304530bc0f620123c7b9cac3866a19f2733b0debac2b53bee2daa8a
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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