Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fa763d5b34c4e2…

MALICIOUS

PDF

76.4 KB Created: 2021-06-23 03:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4513689bcdfc984e90a126cf8c018cda SHA-1: 7b441bf1145ea18725a8629455343bff84c3c2f4 SHA-256: d3fa763d5b34c4e2415cb91de04bfa07edcb2ee98747a52cdc56c63634548a6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully detailed, further supports the potential for malicious actions such as downloading secondary payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://allytemp.ru/uplcv?utm_term=anemia+hemolitica+microangiopatica+pdf PDF link annotation
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/50950657884.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/wezabunizumogimogibu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269327a31f---35461547247.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/66736918293.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/pitofolibud.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f106e4d481---89293708778.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/vupalogusil.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc42bee0e5---14493513475.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/61477838822.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/96279883923.pdfIn PDF document text
    • https://istanajp2.com/contents//files/14107165996.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c253d17f196---23381715532.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5a23c8c04d60246c1da0cc030d4dc7d2/tanopiguwe.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/lodevifaxis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 5380 bytes
SHA-256: f449e08698dab6cdd889e396825e48220f8ab72a9bc9a6e11ba8d0d12e711d67
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 1580 bytes
SHA-256: 3358a6437549343507701e44f11cf0d189771a3783ebd05913451af96e685fc6
font_02_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 13100 bytes
SHA-256: 725545b618cbfedabdca62203a608096d37ae415865b06b0c6987adbe808b590

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