Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ab41c5e69c15f9…

MALICIOUS

PDF

87.9 KB Created: 2021-07-17 16:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a806266b5afb6295b72f0737387ec3d9 SHA-1: 9d40ac0400c53aba28ccf6fee97492b53cc31e2d SHA-256: b4ab41c5e69c15f99023e0a7e119e96eb897ef1d0482e4e92218095a0830673f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bogelaipigeon.com/upload/file/42193351521.pdf In PDF document text
    • https://khabul.mn/mmpa/userfiles/files/98656483654.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/11674106408.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/25741435587.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4jqdd3egtekdteq003f4n2jtng/kugizawadiv.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/resuxirapurazeguki.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0a0e9b2c0afea576e4717537271c508e/pezobusilitirelututem.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/guguwifamolu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160734ce10f767---zukepaxolodazunigoluja.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/remoko.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd6ed4e30b---nutekikisikimusenuzili.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/migurinogugalogesanejir.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/31980857428.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0qeto6jjknodu1n950v3pa560q/jopejaropawaz.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/wowotadalopupibirutugir.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/xilozadatisop.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/pemawiru.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/73327450527.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5ba17bb6---zozokizazusutegus.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/napapedefezi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/1524159186.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/dumilidoze.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/ziluwobeloligidamofad.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/gipijazane.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62f481174---65989295554.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/sewatupuxidirofad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+building+tablePDF 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_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 10596 bytes
SHA-256: 9099e354e9a9a57a24b902e9054c256e0787d021ead5b13308437db6a1e84eac
font_01_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12524 16912 bytes
SHA-256: aefa1ffd64a5658585a8ec797912a427a6999d8570e2f0a8e848719e6e687145

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