Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd88f18d24c2d340…

MALICIOUS

PDF

73.9 KB Created: 2021-07-20 22:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f047aa50d9ba22915b83fb8222e8814d SHA-1: a4caf8dffcdb8b2c89c5eb6384af1bf859b34f3c SHA-256: fd88f18d24c2d340f06f068a3ef7760eff0e7b2a655985f32190587a8ca60694
146 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The document's structure suggests it's designed to act as a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3310

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
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://zetrade.cz/userfiles/file/22765560577.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e51ecdc3941---jumenotokemeta.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vpr6rg5e4f4mq16rauqpuda8ri/7219955299.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/32070051458.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/df4d350fff9672201aba1a8601470579/matibikaludoma.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/844cb31786c1b354c47db39699ed7161/welowazut.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e44448ae8---45243440119.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/sitosez.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/68707227563.pdfIn PDF document text
    • http://thaide.org/userfiles/file/ritimesedevozitof.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0be2c2cf77---zolomuwawurelomekef.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5ncfgi3uerqgikk7r872t0bctn/33429741152.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/67e543761c15aa8467e61f3d8b143abf/37120486762.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5939e231be---nabutageripomozaj.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/34409551053.pdfPDF link annotation
    • https://bimetoor.com/basefile/bimetoorir/files/rebasi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210610003808739.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/28540587476.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5d0ebbf77b7ab49fa23845911164fc83/tetop.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a26c871cca522546927f0b58154dd1d2/vinitokutorawegawe.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/pomexejemurubuxu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/47538653928.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/72157310783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+sum+of+two+consecutive+odd+numbers+is+56+find+the+numbersPDF link annotation
    • 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_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 17456 bytes
SHA-256: 060a0eea3ad126e23eb0014f7f087a4af2c7c21d2108755452cdc8b149fdf840
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 11188 bytes
SHA-256: 2795d72812472e12ed509ae83a03d2034fac7b20944349060d85aa397568f92e
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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