Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffb3738654eef1d…

MALICIOUS

PDF

85.1 KB Created: 2021-07-28 02:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 302256b5b0a90cd7dd786721ecb52c9f SHA-1: 445e3764f3530894104bbcfff589021f9f4eeecb SHA-256: cffb3738654eef1dc0222f4d3f54cfd0473da1a70c5dc7daa13f54b9817cc66c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites, likely to host phishing content or further malware. The presence of multiple distinct hosts and a high number of links suggests an attempt to distribute malicious content widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094296ca9706---88840261654.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d375bda45---xesevibelazoxus.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b5ec2f76de47318d232a71c0a4c9b384/nogovibuguzojejuges.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9724e0dbbb---27092906467.pdfIn PDF document text
    • http://woykoff.hu/upload/file/99097213517.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8848fce9cee9015888c785550b9ccce9/9112000466.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7e062a0e357487b59cf866d01cf40a2f/binipugaxatarunolux.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/62772522486.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad76765efba---budevavukutofaramepinexa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/50sniuqqmemd47dodlftg3vsm7/30381311360.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/bimonake.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/towar.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/tulurirenulisa.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/40b831a699ed05b13a07d63769a88402/2320976230.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad899247be9---rulizasovejexug.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a07133f22---tebuzexaxum.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/winudanopisugaxurek.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e862f616---pigituxaseduma.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/juzobiwetokivukoxexulog.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/nilaniruw.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/483284682.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/68055976963.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5424a4e54c---zibesimuzoxavif.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/wiwizejimegigano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=erie+metal+roof+reviewsPDF 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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10404 bytes
SHA-256: 99997a673758087ab4c3316bb9c3f4d191139de256b3e98bea6d69bed0abff4a
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 16912 bytes
SHA-256: 30eea8fc981ca4a960c7ae44769e1626abef445b3dc2467b7aa697c49d8a34d1

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