Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb3c3845c600c1f…

MALICIOUS

PDF

93.2 KB Created: 2021-08-10 19:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d21e0f98babea6e16e8a9aad2418c8b3 SHA-1: c5ef428beb81cc2704486e12586a8071e9479d0a SHA-256: fbb3c3845c600c1f511c653ac30bf2e3d0071c6ecc98b5ef3d4634a2a5957f6a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • 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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d77474245---86037244807.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c1282198---tomigivumob.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/697b8bc849274ec8f6bf88ed350e99fd/xizidugokijojonegililixa.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/wexonu.pdfIn PDF document text
    • http://aweibel.com/Photo/file/diraxoluwonam.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91a8248d6---43695496139.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/42448986347.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5259f27e687b3efc1dd955837d3e22c1/14819113602.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/51498180033.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/98972993523.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/786be0ce58e987c626f3f36ae2cd3c69/tomatifuguledezeloto.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c468dec8ff7---sagigabaxifuwimo.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/2765673536.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/jnu70g1s4mfgdctj07h0dntq7v/vofavotibivepupew.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f0d5910a63dad2d69167a4f1a29606ba/sojiten.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b563f163f3---pujusutijabogapitebi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/n63lsmaatjanmnk41ov137dm50/bogisuvifikigexa.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/dedavufowalipixexi.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/15702117578.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ddadea59---misexisomolasabod.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/na446jt83a7a9nn1ftk95sp1cs/51452633075.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/22487616389.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/xizunogoloj.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/15019311309.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/gojozugobamotipez.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b9f8f6ce13a08da4e58332f2e868166d/tezanuguradimizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+are+some+cool+girl+namesPDF 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_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 10672 bytes
SHA-256: b0f95d170f9fd79dc1b632d351509ae7781ca9ce0a87d26b3006ed6cb2e35218
font_02_sfnt_off000138de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DE 17344 bytes
SHA-256: f768e65d72a915efaf2973b8c14d02b5c2328c8debcedb3d73578314c3176822