Malicious PDF — malware analysis report

Static analysis result for SHA-256 81288c41f421ff04…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 10:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd6398f8847b0f333222e0f5990a944c SHA-1: 4bbc23cb650bb96c091517861e1ee41764e95691 SHA-256: 81288c41f421ff046f64ad82b146c0e555cf89f240e477bb49665ddcc6dfcf86
116 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS uploads. The primary attack pattern involves luring users through a seemingly innocuous PDF to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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://akicgiyim.com/userfiles/file/12315500446.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/12698ae4e947b79aecbd69af3de33978/56610980962.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/wubitepugotuzo.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/11760516209.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/77035042588.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3ldj93s6hpl098bbbe0jicdjdm/52926181739.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/67854267505.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/metaziwaz.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/fomexolobunorukujuninaj.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8d6ac7e0f130c57c18f94276241b4a00/vilarovafazosiwilixalu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3138dacbaf575feacaa281656fe53594/69266252257.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/gezebugadunewasel.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f05045e2f67d155b6d352a89d63fc74/3274969885.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/bavixinupiwuputarenuno.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/83126556307.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/pelijetiru.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/57279067126.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097061610e32---20916550643.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/22491279473.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/d2krh7pkkl6ag7hrnvmcla7mb4/jozubaxujujakorudi.pdfIn PDF document text
    • http://air-ned.com/uploads/files/vejosulabob.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83ab08078---gejab.pdfPDF link annotation
    • http://volamtuyetthe.com/userfiles/file/vemivekogud.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/17df484e18750cb0b6c79a35a1cc9528/xonawufenepabubodonelup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+convert+pdf+to+word+on+macbook+proPDF 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_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 10852 bytes
SHA-256: ef25b93475b04534be5de7d3e53a6f173997cfc98c8a7c89ddc72944c6fd17fa
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 17616 bytes
SHA-256: c010a5967f52f56bdbb7c8f6fcbfce0d5d15bda610d2b6c96a65b41669a57477

Open this report in the interactive analyzer, or submit your own file for analysis.