Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5984ef620b0991e…

MALICIOUS

PDF

86.5 KB Created: 2021-08-13 21:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6465cffa703ed805123f6bf1b9f18a63 SHA-1: 11db56514b81e967ca3343d010fa49e5fbd94d25 SHA-256: c5984ef620b0991eeebe72b0d0327acd0e1a2630594b0a88549887ce9ca63640
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick the user into calling a phone number, consistent with callback phishing or tech-support scams. The presence of numerous embedded URLs pointing to potentially compromised or disposable hosting further supports a malicious intent, likely to host phishing content or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://vankouwenenmastop.nl/UserFiles/file/65067195730.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d113766e3e---tipiv.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/232d0a91e10e3220f5812f7acfbece32/54305035035.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/konesafomapimozuvono.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/58084455074.pdfIn PDF document text
    • https://brs.jo/userfiles/files/82886284370.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608145d33d126---nelav.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8271b8f203e11390eb3959ee1280beff/92655247049.pdfIn PDF document text
    • http://bptramptour.pl/files/file/zixewapefad.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/04c91879c1f5e78430612dc860ddfb3d/niwakunamovudigurafuv.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/30731765769.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/jitomamanipe.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e8dc2f94f---jodifu.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/xivegetulit.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/74e5cca34288c73006adcc1ee703645d/50306962086.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/wopirawapegamebakuz.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/69135240380.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e7ea4221---76885922066.pdfIn PDF document text
    • http://keacg.com/upload/files/xemulibodilavizulo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae2acca4a5---34945546219.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/kuzakawumumulex.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/35523582430.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16079cca256261---lupodazijusuvakol.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/13321935436.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/1894580525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=f%C3%BChrerschein+klasse+b+fragenkatalogPDF 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_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 11016 bytes
SHA-256: 2ec693c88f857a21a86c8410dedfe053fd26f09407e7946975825d91bf297af7
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 18236 bytes
SHA-256: d11fe13ae556006576dca516b8f7b673511eb97697c2c7f4a71a774f3a8142af
font_02_sfnt_off000131ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1