Malicious PDF — malware analysis report

Static analysis result for SHA-256 9827a4bb2c31aa9c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-23 00:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 305119fd991e59479fbf44b891a146b9 SHA-1: b3561b51940c9a3eaf9556e75d28de3601daed3a SHA-256: 9827a4bb2c31aa9ce2ef4a73b1fccd4c6c8e76d8ce33c64c7defe96cb4e0dbf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several URLs point to potentially compromised or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF files hosted on these domains reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://dooroc.com/tk/upload/file/54828006532.pdf In PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/40294730834.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/96634694896.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/98749746313.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///pudunixelizokodozutin.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e4748386ec35c3deb1dcf0dc9519c47d/rurevugaxogawoxikitoziwit.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090519570714.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/89614004191.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/20864629640.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/zodipagutopir.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd37a87b5c---kosibosupadupelerenexagu.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/gojidemalufune.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/vonerokedobuzagefomival.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/31707725145.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/24248585039.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090211560017.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vikenozunovozazokotibeluz.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/sesetasonak.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/79ca1e235e1585f2c4852b3104994730/ropolelamolirobabadalevaf.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0dedbf085a8097609197ebe7ba4277e9/xufetomiduduvorogu.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/lonepuv.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/bojidowewizumorimomavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=maleficent+2+full+movie+englishPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 15636 bytes
SHA-256: 882a7ae694f4561f0c9333c9ece23bedde2b455b875f7d34833e5a483000d11b
font_01_sfnt_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 10960 bytes
SHA-256: 381491915b6c8f13e5befab684466f60b74985909b8acb48e6075c437729b203
font_02_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1