Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1bfbd068da8a7d…

MALICIOUS

PDF

108.0 KB Created: 2021-07-04 00:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1ba1d2f4ad8a58e437d97e5c66ec3417 SHA-1: 255daaa02a03da785be6d5d702f93fd833b3af28 SHA-256: 3b1bfbd068da8a7d317ccce6230c2d68655f1edd55501ca5272e688b58aea18d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9f4996ec---15346318693.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4p9kqr79eptr6nsoab97r4a9a0/3745083604.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/42941151531.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6719612bea570bfd316518412fdca48d/58644493592.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9f4b2f7678c060f3f2584e5667fb28e3/87196385940.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e1599da7f18a8ab5a09b39331e65a1c0/18824635096.pdfIn PDF document text
    • http://splogservice.ru/content/file/92285529654.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bab048cb1---85760758151.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/82479215142.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b637c5bd823---44783843829.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/70507815597.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf8e55cd8---10680151245.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/88563130128.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/21615567731.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050610504473499.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c230fb5bc85---54718608715.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2b6853f5ada888d70f4f3c484149cde8/worasulotes.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/lofedepolewawesapabewamu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a092ffb4a3b---80681361957.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076430d9beec---rodegareno.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092b926e5fe4---kewuduti.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/h400t4rhh79hffbbi30t0eitjp/98164397351.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/705602367cfa164cc17878b3d0cf9aef/96603500673.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bf1d403c70f35b8e91ed9de80ffe2749/delojisulofosajufumikepag.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/56839190473.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/086ed6575273f65d76cf24d2656dc4ff/xumitu.pdfIn PDF document text
    • http://bakoca.hu/files/file/nelolabukuzusum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=effects+of+population+growth+in+nigeria+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_off000142eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EB 17728 bytes
SHA-256: 12967e54a85fc4f62471131995c9eb81e3a57e1aa15d1835eea3ff05939980f5
font_01_sfnt_off000170b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B0 11068 bytes
SHA-256: 6357a4c6eea52eb26016c0c366f8fbb23463d077b815b217a0779641dfde5426
font_02_sfnt_off00018a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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