Malicious PDF — malware analysis report

Static analysis result for SHA-256 8563b6dd58cc3e0b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 17:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da5b845d4fdb7374b069cc6b04fdc962 SHA-1: 485d56a9fbad9bec10b938e6be0db7d837d211b1 SHA-256: 8563b6dd58cc3e0be0444550f2e7b3929282a917cdc178fbdab26d494ad81a6d
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm pointing to potentially malicious content, including a direct IP address and compromised CMS uploads. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://obraz-tlt.ru/userfiles/file/53249899666.pdf In PDF document text
    • http://www.huntsvillepr.com/files/files/2480976926.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/8421724937.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6140588100.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/sipagopepuwidorolelajin.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/42423889541.pdfIn PDF document text
    • http://leruichem.com/upload/files/soripowoxinudagigijoveja.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210909194448721.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/vugovunoretijipeb.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/95836924013.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161389db662b2e---37374104233.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161329068973bd---zosaxepapelenuva.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/pijepenu.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/bugove.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/99888928936.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/2999163955.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/xefodogipogi.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/32925984104.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/56589107277.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/sevoko.pdfPDF link annotation
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7b467b40---simiza.pdfIn PDF document text
    • http://polipack.ru/content/file/23818080984.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109051808351237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cara+menulis+tulisan+arab+di+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 10680 bytes
SHA-256: e1bfc2f396ee3192bbc2af5858f06d3ccb6de10c12004dd350f14a57ab497d79
font_01_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 16980 bytes
SHA-256: ec211eb34fce9caa3cfaeb0667b4bed10587a90e3e1873c833996e500a8655d3
font_03_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 16076 bytes
SHA-256: bd049c1bb58ae1406c9d23e8cbe0e0b377823d96df10ad93228c6832289cd380

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