Malicious PDF — malware analysis report

Static analysis result for SHA-256 8add35f3cf03063b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 14:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: beb57e4881b5679edc3025175ce22423 SHA-1: 7a4287112f6710d7c58d40a283a2e2b33b95a3c3 SHA-256: 8add35f3cf03063b82dbfdec30c6dba05e135ce1a4902ee20c0ad7c9f858d79e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations used for hosting PDF files. One URL points directly to an IP address, indicating a potential attempt to bypass domain-based reputation systems. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8991

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
  • 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
  • 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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e7so2s06gp4ppcbtou19ijeo6h/92175365595.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/98d96601bb4913959f046d1fcaccf80b/83472093554.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/3039872698.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/4an8oh12h1d3i72v8taa0scogm/96665507893.pdfIn PDF document text
    • http://mesterek.net/tmp/73455951662.pdfIn PDF document text
    • http://hasyo.net/files/file/mifoxonadagixidanematod.pdfIn PDF document text
    • https://www.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d4b1827ddafb16d58475b66bbb4503d/40804886758.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5a63673fb---43113557773.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210619_FFDCF6BF33641004.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839351fce4---garemomanexelawi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/da53f265a97eced41e1f3e231b985f46/gudizej.pdfIn PDF document text
    • https://mar3ol.com/Files/files/todepuvejakorake.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/nevuve.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/73032524069.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/00173f44e6938d6ff7588a74c885247e/lepazugozeputepabu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaa5534dd---28961415576.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/kumajosunalebefenaxelu.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/vasazoxegajesijimuvoka.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce8d339f61ede73c83966c75a0fa597c/latudogimadusakakifevisi.pdfIn PDF document text
    • https://posh.hr/files/likotobomafovavesewan.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/23158875414.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c75e06b6---rajavawe.pdfPDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/10230daca0b1eea902e7f585735e4f15/6237560828.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160de7bf142be8---gujedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+triangle+midsegment+theoremPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1