Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd5edff15e51692…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 14:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b572eded1bca2c87fdf8babcdb2013f0 SHA-1: 327fa43ee7897620aaa88a1ddc6e71bd914b740c SHA-256: cbd5edff15e51692657954dfbd74bdf4a44c6f31189d0332d7bc94224ab73466
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various compromised websites and disposable hosting, designed to trick users into downloading a payload. The presence of a download button lure and callback lure further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://ketchas.ru/uplcv?utm_term=self+esteem+questionnaire+pdf PDF link annotation
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pp6ccnabuo4gd38q0m2famvo56/vubexeg.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/nasanobuno.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/37914053020.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/dorurisopep.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/80f176c9e23380cec9133e4ae052150c/terugogujozuvidimemibesi.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/fajamixipaliwotizoxeriz.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/54682681575.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e275a8e26a4c7d82c5457727b2de516d/zakufakujiratusizipudo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb79cf004---99334476510.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/27637457741.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/12850404706.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b5d0c84b7fd7fa4c6762036133d6c242/kerexirewemanu.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/retip.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/86323523030.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/ginoxuwonanedugod.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/13dcc40538a0cd7ff751ee9b7471385a/jatamijufefonufawab.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/pizaseberebixag.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/bixipewopuzudegapumur.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/kimofurutesosamimulajiki.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/2341051415.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/xujis.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/rivoralumevefulupoto.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83f803936e---raxukulinuwo.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/jifikak.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16110faa42288e---68654851344.pdfIn PDF document text
    • 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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10980 bytes
SHA-256: eb417fd7d3741e70d5afa5f45cecea41fb47936dd3d2ed4f7b15476fddf8238c
font_01_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 17928 bytes
SHA-256: 8b80fca4502108b949247d156d7aa41a5bac0c35cc452ca29586521486a209c5