Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e17c9fb139b21e…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 19:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74415f4fbb6835149ac2f2d9dc57e97c SHA-1: 305c52e2f75faffb8c77a553acbd58e1fe092e95 SHA-256: a6e17c9fb139b21e37f4f7bb1319c84a574f491b45ab9307ebdeccab752f1914
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36f65b326b---bedidakam.pdf
    • https://atl-50.com/files/file/durabosanikasif.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afa08cd4d91---98801133481.pdf
    • http://naturallabs.de/userfiles/file/dabumovenidipokotonedaroj.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d641498b00d79c0c3bc6bd8bb4111d73/mesulawirugojazomez.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdbb232825---gijos.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b576b7763d---90790376090.pdf
    • https://stradatextiles.com/upload/ckfinder/files/devaxiruzofotedeso.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6df979a2---jitosonupuvafi.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0934047ae96b21366bf9fb80f17c48a9/7160135015.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cce5189e---tiganalapakug.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3b089e1fce5c0bba38feb0b05e1ce607/fetarubovolaxapudijujujuk.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c2ad3582abe---28373451931.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/38093684637.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee17b456d---78874761953.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/95528278767.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/86985860417.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61806d9c5---5069636770.pdf
    • https://aartipalette.com/userfiles/file/tedani.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c345c61bece462753d39dc73ec905eb6/kepidezetid.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160782a71098d8---6237616708.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/xanugifafumotimex.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8b23e84ae075d23ba5f2de046556edf2/soxodanaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=you+were+my+one+more+chance
    • 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_off0000ece0.bin
08ceb30dfb188409caf1e04c65d0d0bf356b0fd61aca5ad43d14b019593077c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 10376 bytes
font_01_sfnt_off0001042a.bin
fbd7ac40d5ea238f68285d1779cfe9b0793c7b3a63cdf41d03dae60b0411fb2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 18412 bytes
font_02_sfnt_off00013422.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 16792 bytes