Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bc0b26e3ada286…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 09:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7496f5700dde0e9f67a8358d9ac89a8c SHA-1: ee6cc70cae1293ed7bb2a2ca25d85f8a0c44512e SHA-256: 81bc0b26e3ada2865314108cbd1eb88252d125efc71ea146d0919958e49ab1c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a malicious document, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ingpoggi.eu/userfiles/files/fonijoxipatonemipi.pdf In PDF document text
    • http://aaykpn.com/uploads/editor/files/99867252651.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ca8tn320jbkbecarl0o8to3of7/tofibewal.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46df09d8d6---zaparonevufewabakizul.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/rusuza.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/lagewinefefosuw.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/61602517065.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c0612a3bd3eac383a3a20039898e44a4/50758669456.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160870dbdcbfb8---77523266582.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/5312147206.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b946a18ea35---42491568558.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/19106992714.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/88646338355.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/loguweworew.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a66390bea5f---dajemek.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/12444551047.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/punisebuvumesum.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/ziruramaw.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/fokugo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8991157eb---gatudiwola.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad653ca173f3407431aacedb041daeeb/80572533327.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/vapunumonobodazulogitove.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/86689832030.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081caf0197a7---fowevadilasanujugom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hunter+ec+watering+system+manualPDF 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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 10744 bytes
SHA-256: dc21821a5118cb9603f7cdbf873ef05d54b33d09fb9c516ce869354684370a3a
font_01_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 17304 bytes
SHA-256: ea883b703a6f8a4f1dae153d9f6a8b619334888ff076d4fe76a8b043d8a4ada1