Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c89036df5dd1238…

MALICIOUS

PDF

99.5 KB Created: 2021-06-30 21:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9b06f8dee964ceea3929b3708794bf1 SHA-1: ffdba429e2ead5c02a9aa18afdfc5a2721420726 SHA-256: 0c89036df5dd1238f7a0fa41de944efe279dfc89f05fbd23407d3a23b2fc424e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7075135574---27174346404.pdf In PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/59568775934.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/88434c5e0e8052ffb68839dcade61cdf/taruzikunetexopunupi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fad90413c9acaedc604e72ee6b7eaf84/nizevuji.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/jixapivawod.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/kaluwobodip.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hi720di3pl77elggd8ud9e7ak6/tamelam.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160749f0dee6aa---8430818725.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa63c24c7---69021526504.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c7dcb4cac7a0ea9d5f3830094f1a523f/lalug.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/40467220346.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/dogiwawenemekabapaweje.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607828df0fb4e---jiwunufadidisufaliramu.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/eca616b2138ed82aff1d658f9ed4766d/kodowowuvemepevazuvibetix.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db21479fa---77394062431.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36d957a7e---nimobuwagalomi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7d23761a---gufatolulepilulesirixugep.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb32dd2cfc---13371800314.pdfIn PDF document text
    • http://kme-kme.cz/files/file/vifumaki.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/tukopa.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2e7b1838---tamutu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee0eadb82---16354213741.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4b582140---loxizilosiv.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/67571515654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=auditory+processing+disorder+occupational+therapyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 10988 bytes
SHA-256: 150aea8eb2800b61d9b5fe4e9fcca4f9fb0467520db31d7bcbaeb7dd7fdd905c
font_01_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 17792 bytes
SHA-256: e58f065ce9e5b0db83d387b8c578a155c14df758b5f361f036ad9f2c4571c06f
font_02_sfnt_off00014ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBB 17880 bytes
SHA-256: 71c1c4f6595dd41d36401ab4499773fecffaa048b956d3021e348b76f574596b
font_03_sfnt_off00016807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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