Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb144bd677b8ed9…

MALICIOUS

PDF

89.4 KB Created: 2021-09-01 03:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53a7dda58aff5a04a293b1f4a222d8d3 SHA-1: d4a32dcf3a92c1c21d303b66b5e6b2c04bb24091 SHA-256: 4cb144bd677b8ed929626c604d919c0735e28163b086d1e8dee674cbef6d4fe1
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting and URLs with UTM parameters further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://archism.ru/uplcv?utm_term=four+corners+game+rules PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160929c7413000---68890542945.pdfPDF link annotation
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/3d8563e29db9de53c2f281aa51e7cf93/pasulitox.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/35563340121.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/zugejijedezi.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/63763056753.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/86001708422.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xugajiwunuxil.pdfIn PDF document text
    • http://elma1.ru/!upload/files/26916447704.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8lu44uqg5kbgrqljupp98nf8bu/tivexaxa.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e096841c7d---sodisubibikigowe.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210523130856_59126365.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/7215146073.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/xetovibonuritus.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c585c5bdbdb---mujomezukofeda.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a8653809---53579221599.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a95b2c5d942---lobomemufatesifom.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/69357685968.pdfIn PDF document text
    • http://garderoba.sk/images/_file/sokubaja.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607644487a52f---90356736825.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/zemisukituxilo.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/kirumub.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_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10460 bytes
SHA-256: 4451ec2389aacb471652fa2a18d64cb1ad97a94fa2f20375e8c29312bbe7645c
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 18360 bytes
SHA-256: 1601347b0834332f203f4da5693c8814dba0e56e341c6670c56e8ba4639ccf7d

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