Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4046eeef90148f…

MALICIOUS

PDF

83.9 KB Created: 2021-07-08 20:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e7c422eb51b461ceee6ebb843661fc2c SHA-1: cfead7732e46ee168e9787230919f463b5beaddc SHA-256: 8b4046eeef90148fa521620edbe3f4aa2a16b286fe9a2929c22ecfdf9d1c4562
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to unsafe destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88bd900276---72430155432.pdf In PDF document text
    • http://benevolo.it/userfiles/files/28376883736.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a43bd14f433eaac9b884f12580f9876b/gadexixa.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/kojudetixisamamosuva.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9bb8bf738998afdb6803c80fb5996e05/90447019183.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/88061631243.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac9808f81---33241120735.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/69813333276.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/weparoraturulidowitoza.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958bce2c20d---38153764144.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/49753575478.pdfIn PDF document text
    • http://palami.by/images/file/dodaximaxog.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4980f0374bfdc2499e2d1a24ee8e46d0/57792187617.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/gajuzoraliwaranipelobuwu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17d51cf3b---bojenilinevofawanimumewe.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/56453832373.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/sepanojugoxifuxaga.pdfIn PDF document text
    • http://skomi.ru/img/files/file/31933236829.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ebead7c7ad844f2957c26c2eed814d46/8809722569.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/sivegejakixusixemobifuwa.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160984f38822d8---dumomukagolufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dr+trigger+happy+havoc+charactersPDF 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_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 17296 bytes
SHA-256: ec600bc4aff1eb120ff557ee350b96f3ed5d0d217f8122c1d55b643cac56e211
font_01_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12993 10684 bytes
SHA-256: fc76ca27b0dee2aa5d9401e00ff3bee10ea691a06adef236ff7776dffde83bcb

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