Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c91bc7fe701e13…

MALICIOUS

PDF

94.8 KB Created: 2021-09-20 03:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1751db1d2ef640eb492e4cf00c460d15 SHA-1: 8065366d0c57d12c60d082cc42cd372ed0baa782 SHA-256: d4c91bc7fe701e137e128335773085e394e42b18c4f5d1d885abea0663ac534f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, using lures related to lottery winnings or parcel deliveries. While no scripts were directly extracted, the presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests a malicious intent to redirect users to phishing or malware distribution sites. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://altiro.nl/home/tjerk/file/63467103449.pdf
    • http://stmrcstvm.com/userfiles/file/19583227311.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314a8b1c0e3---gaxinibiziwutef.pdf
    • http://thekitchendesignstudio.org/uploads/files/52785803528.pdf
    • http://pradakshinam.com/fck_uploads/file/66142443768.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a003e1dfa---vovawijamibibirevovo.pdf
    • http://15441707.com/data/board/file/20210916002136.pdf
    • http://newgrids.com/userfiles/file/94211829908.pdf
    • http://www.moyekolodin.com/files/pufikoberovofeliren.pdf
    • http://casaatlantida.com/userfiles/file///77885910547.pdf
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/81186633381.pdf
    • https://ratsimae.ee/media/contents/file/79504611628.pdf
    • http://alarm.pl/userfiles/file/11706824491.pdf
    • http://pescepiana.eu/userfiles/files/5418438065.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331aea522a7---54675910584.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146cb731d664---jusepavodoxep.pdf
    • https://ginniglobal.com/uploads/file/60790870449.pdf
    • http://tlxzkj.com/uploads/file/192320473805.pdf
    • https://seltec.io/images/uploads/files/38665218166.pdf
    • http://gdlianyu.com/uploadfiles/file/wamoserukusigotivupafox.pdf
    • https://kudamatsu.org/userfiles/file/kupuwumuripef.pdf
    • http://www.donboscovizag.org/images/files/86418900898.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/42842192219.pdf
    • https://ferropula.hr/files/bitiwapumis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+get+free+money+in+bloxburg
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da5.bin
759351f5ae8a0b9aedab2b54c9d0e66dda647ca968d745b3be3b03e3606dcf2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 18148 bytes
font_01_sfnt_off00013c98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 16792 bytes
font_02_sfnt_off000154af.bin
b9f56f40950d2f8492264a0cb73edb956fa287ff8edb8d000da96d746d62615b
pdf-font-stream PDF embedded font (sfnt) at offset 0x154AF 10900 bytes