Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b526948571e6a7…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 23:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24e781d030adb450d2b2dbba5d096dfa SHA-1: 3b751f79070204673667498a4529d9ee6906e742 SHA-256: 13b526948571e6a7d10a218dd10fdd7302e388f4e498b0cea9035061378a4fe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://ketchas.ru/uplcv?utm_term=best+free+single+player+pc+games PDF link annotation
    • http://t-eamplus.de/web/editor/files/vuwawesopuvuvofatilazupu.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/pakivofenotu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a20a4e54---todifur.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/wowaxugerexorepil.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/4aea8402e44229fb096ea8734a259e81/sevek.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/fiwatalirunobafubilem.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/58131985914.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/67fa1cba9b041c45f099200e3c6e6cad/64140505080.pdfIn PDF document text
    • https://ovalpolycoats.com/media/nuwozinifebeviz.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb720497ff0---24053754033.pdfIn PDF document text
    • https://digireg.lu/upload/wojaboxevidolu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/3363273040.pdfIn PDF document text
    • http://apsons.eu/files/file/90232735411.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/54565102871.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb7519d97---bexikigimitefofarere.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/nebax.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f508b811108---pubunarujakob.pdfIn PDF document text
    • https://12tiga.com/contents/files/nobed.pdfIn PDF document text
    • http://wawa757.com/uploads/files/xigawifezedopuxubaroguba.pdfIn PDF document text
    • http://ozari-ua.com/files/file/50955742156.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/vefogalukimoj.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/17057629821.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/derepiwenule.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/854222ed57b33627b7f5d02264cf12b4/46127994090.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/gisadogujorol.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/dcdff7b09095d986602565b20518290c/91240244844.pdfIn PDF document text
    • 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_off0000c739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC739 10868 bytes
SHA-256: 756bec5d703d39ba84e59ff4d0bf0b49995af2fb6e7de870f22b3dc99618b0d3
font_01_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 16392 bytes
SHA-256: 23e3235249f4dd76681c41e52fc08d956ee2d14c51f6a8784ed1f5d38c5d2d14
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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