Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbf33a357aa8e9f…

MALICIOUS

PDF

74.4 KB Created: 2021-06-24 01:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fcabe165a7a76d3adee0389febcbc5b7 SHA-1: e5f2b92adee5a30d82ca4d2086fda4f0f5d5fe68 SHA-256: 0fbf33a357aa8e9fe60051b608de2dfd4ca7efbe109a5e83e5130548c37311f3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bititechnika.com/uploads/file/53334075375.pdf In PDF document text
    • http://bi-acaovo.com/upload/files/kaboxolatev.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/vazenuvi.pdfIn PDF document text
    • http://goref.ru/files/file/jemelegu.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/7ab4c29e1adcc58f70ef2bfc0a91669d/13121892125.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607490151f5eb---18139590230.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xirim.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc715d20524---wuxeluzigumir.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab75e2c3d---75911630289.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/994c44295872bea6085d4aae80b9ebe9/40773050513.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e0lhmbbegg8h1ego1cc8pogfhg/pariluxijonozaruzigaja.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9fe8f6b0---26841418520.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/63598413067.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/98304bbffc4c2d3818c34e5e3f023e10/2205469816.pdfIn PDF document text
    • https://agatanorek.com/files/file/23255241130.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905dde59587---xemupabejafofaxagam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+figure+a+poem+makes+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 5132 bytes
SHA-256: 2304e96a7f409fb6f9e75bbe266e992a448be46430d2090ff6bb5f8b830df519
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 10992 bytes
SHA-256: 2af372487c6a38355dc3818f13d8922b5ad64eec577348c6f3692a15af873a55
font_02_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3