Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a3bf32ae2befde…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 22:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a125e8d022dbcfc8f3f8c634fb77b20 SHA-1: 928ef5d9d49be2ef732446537882508025496073 SHA-256: 80a3bf32ae2befdecd360610606d6c3ddb0d195205beccc29a7026ae05c5eba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=i+can+synonym PDF link annotation
    • https://alariel.be/userfiles/file/mofokulovuvomanojukuvigid.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/8379281783.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/powupefanogofetumokufog.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/80135659859.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/292338895.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/14558012133.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7428b71f5602ff0b278201b80166795f/powefibixiposokubosizijis.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/21314581201.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/38916279102.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/gevexarewe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148501dbb0d1---xexigurolinuzegijivezuwa.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/42893874508.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/55888160239.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210916_004934.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/42810474940.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091008553989628.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435ec686b4d---55418641297.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/44546938460.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/fevuwavenerajivuva.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/xavimagiki.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/xenipusawa.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/48571845981.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_off0000bf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 16512 bytes
SHA-256: fa8fbc4ae5afc8694b4ccd0f8174e607831c0377a14534abaed0a98e7bf2aa38
font_02_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 9988 bytes
SHA-256: c4a43421fd72842dd025b7aaa8595e6fcf8299379895c58f15ae5ffd8d23b9a7