Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62e6009433f2e2c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 15:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 825754ce6afeec0c2b2e0320bc94cad5 SHA-1: f43f27a212704bd4712277bb7211c9bea573efdc SHA-256: c62e6009433f2e2caee63be27e4f07cd3e93abdd5f0cb6ffc65c9b87f723d7eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' specifically indicates that the document prompts the user to call a phone number in a context related to billing, refunds, or security issues, which is a common tactic for these types of scams. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=every+prime+number+up+to+100 PDF link annotation
    • http://indecomavo.pl/inc/44101771099.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0e6b2477eb0cfd580de3d8279571066/ruduvanob.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160706d033c44f---70409377634.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/xasanusubu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/r59408ital7h2ha43utds1vgng/tesuwunuvurojez.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/92668686176.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1327270bea---86574857229.pdfIn PDF document text
    • https://aashianarealty.com/file/72910194424.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/83097511266.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/solowupivi.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/xezew.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad330e9ff---mekuv.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/50462344484.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30de5676---vakoxuf.pdfIn PDF document text
    • http://ropesadventure.com/d/files/jekefisawuxepirekizol.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/xutanovori.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/bigumetifumepiken.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd861a80c3---67118136250.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e3f54819---26007089634.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/69870749521.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78256745572.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd26ba6c3---59253578789.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tuduwegepudetaxogepe.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c743d23dfb---23643499153.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/84053048643.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_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 10612 bytes
SHA-256: c94168e707c18f409dbc5c9a401319999a229225a77df0f91f71bf9f1ac535e1
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16712 bytes
SHA-256: 02b3b525a0f5faa98c9dce2c7f2bf0c5630c61a50986084fdcf7dde50ab88fb4

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