Malicious PDF — malware analysis report

Static analysis result for SHA-256 091775ed01a762d9…

MALICIOUS

PDF

101.4 KB Created: 2021-08-18 21:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c74523e583494426f15ee46c88c45b01 SHA-1: 024ec0e17b00019251614001cc42fa9da956a1a5 SHA-256: 091775ed01a762d9698705d2a5f0425841334640c1b3e2e2f590e53abd195fe6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The PDF structure and link farm behavior suggest it's used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tailormade-sales-marketing.com/userfiles/file/tetipuzapuxalip.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a9d1e9ae---50189332978.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b503f7b511a---kijevod.pdfIn PDF document text
    • https://ka-base.no/images_content/file/setujidenat.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/latiwuj.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/92476555713.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/97045089327.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/zirebixabuga.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/5f301e312e611fed7b6e21915b0b8c3a/jevajigam.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/nijesaxozomiveg.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5baab5b6d---68775582448.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/49715151970.pdfIn PDF document text
    • https://matratva.in/userfiles/file/mesuzelenobivuv.pdfIn PDF document text
    • http://netflor.pl/upload/File/45343280420.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/45611149108.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/84976715558.pdfIn PDF document text
    • https://lasanisports.com/files/dibubo.pdfIn PDF document text
    • https://bfull.ru/uploads/files/satepifojuzokufokuti.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3e42c269---28336373686.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160705685e9134---gezesifolo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d83cea66283---99544678518.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/memobuwikodosiwelu.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/duxibokizifimazile.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/29209683466.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b3a51e3b9b7b49f7315889c6a129741c/7260269590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+moon+is+a+harsh+mistress+pdfPDF 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_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14166 10680 bytes
SHA-256: 7e1a86d20535074db6ed45085bda81bc37379d697881ce1037bd9edc9b044ebf
font_02_sfnt_off000159b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B2 17232 bytes
SHA-256: a87e74fbdf3c475f7a8e1500d0ffa54655bf63a9577039c80de4e0f468bb6779

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