Malicious PDF — malware analysis report

Static analysis result for SHA-256 f993cea8f838a948…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 14:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ecfbd57796705d922448c8d9303c33b SHA-1: ee2556a8d27278b16b58b7faa89d6056f1840a75 SHA-256: f993cea8f838a9488b4afb00db81b265bda059e6ca15a40f3cf73e3186808dbb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of multiple external URIs and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://coretry.ru/uplcv?utm_term=thematic+analysis+in+research+pdf PDF link annotation
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/scn99bjj4mu5huovm0qkvv4oot/segitepa.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160724bb984867---86443806627.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f6e8226eb092991c6d271a79c3661546/61197145448.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608838c7302f7---41069030298.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/70595538146.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/nufaginuz.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4be00552487371f2097505953b2976dd/fipijeroxuligarujatepegot.pdfIn PDF document text
    • http://dges.in/userfiles/file/34240400814.pdfIn PDF document text
    • http://terrietanaka.com/library/files/98003925681.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/xogemenimavovura.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0445ad892e33cc997f41683f607c5bd4/46573307475.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/karaxerut.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/19897778942.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3d27c01cad4afbf029f09e9b6fd265eb/rapomedov.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fijisisadom.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21af32c8e---bezelagipolufujeduma.pdfIn PDF document text
    • http://artepcb.com/upload/files/befepobirujexeno.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/44585893254.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080958d7c1f7---romisomajifegu.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/patozifak.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ef4141170e8a3f10efac08eba00f152c/kigejevugidin.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/i9bhuuvimbllc5ab1tebdtkt15/76010335262.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/48327295902.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16128db1caae56---18318265718.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160928851aee3b---nisokulesulezo.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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 18388 bytes
SHA-256: 6a49ebfbc2a52f464548dc36d0b8998f13937b198297766d7913d3d060cc0f9a
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 10844 bytes
SHA-256: b853ad2f31636c043f9d3657fa593bc72aff8692c3fc5abf6b2da81dc9be7349

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