Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbfb4d73e105477…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 07:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 735df2379db58c9a0805a2cda3a3c3c5 SHA-1: 96f354962c72abab1d9428d854a2e6a67a0031a0 SHA-256: 4bbfb4d73e105477311a1ca91866d2f0cec0e37f89f3238847a8396e2697918f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, directing users to numerous URLs hosted on potentially compromised websites, which is a common tactic for phishing or malware distribution. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=iron+man+2+game+for+android+free+download PDF link annotation
    • http://a2kat.ru/userfiles/file/93903908956.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/xololitotonugekuw.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/zademijogoxiwifiw.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/xerozibavaxo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161443cebe7800---minasivobulugusuwiferi.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/33176517136.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc2a17146---19928484102.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/sikefabunudurefojuxoga.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/25669205074.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/zokizanixepifobasuzaz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9tlejksd7a39db7qfs5rt7qvj7/wotadopunepufufib.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/gokosaramejo.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/wijovegozabak.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/talinovedamitijew.pdfIn PDF document text
    • https://bloomeng.com/uploads/69389242961.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/satamar.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/67992443301.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091003362573499.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613680b430af7---58011056497.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/fevuxuliwufekovekokofaki.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/xabusawakulebube.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/99466098949.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/bezuxo.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/39204214567.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091406465072.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/28997280638.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/lunimupetenuxipelev.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_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 10588 bytes
SHA-256: 916bc6e22d67b1cd21e931cdfd281dd225c9ac2f5dce1d583821d6994a3f437b
font_01_sfnt_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 18380 bytes
SHA-256: a8c895a8c162b4776bcd470182b804ebf0d252841e939a7f5ad81f5cfa6eb797
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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