Malicious PDF — malware analysis report

Static analysis result for SHA-256 a187e1f1d0b66f21…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 00:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12a07183fa37988706118a9f55ada7fc SHA-1: 9d63f0d024c366b6ceba0fcc5e60226830c45fdf SHA-256: a187e1f1d0b66f219e9e78d4ce0fcd99a12185fa1cfc7480ce3eeb55ac04629d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL destinations suggest a phishing or malware distribution scheme.

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 http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087c21c0fa1a---zepiruli.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/6054c3ac86ee2f920acec4b7ad278797/18996543313.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607909efbe942---63004882962.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/rukemunasuzeferapetaj.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/44eouo7j81siu9fbkhcre83tm4/60144758680.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160834a7ee4dba---dogumenekuwegekedawamak.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160753e4c5f0a3---99523485896.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742c52837c8---30976147619.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/92142395814.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/92085731495.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/35931321144.pdfIn PDF document text
    • http://grupophi.es/uploads/files/6183440730.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/kuxufuvugoseja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a14e48684---16425123315.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/boxurepojanaxone.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072006704b0f---76441850321.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/guruj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f888bde903a---togunifajeve.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/wemedelinur.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/jedak.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/92228824613.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc062caf1b---36722476268.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/xetizagobog.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/fopotatifumogonesexaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=post+traumatic+stress+disorder+treatment+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_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 10836 bytes
SHA-256: 21922c8323ab81a67d8b3dfd48d65bf9a00720e6e0f1e3106453acf9ca376cd5
font_02_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 17068 bytes
SHA-256: 93383b7de3a474529b7bc2498f096b727734ec799ddf8d75bce8eb27a0556cbf

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