Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4aba8d2eae08592…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 09:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d908bfc444db63b8085d79ae16bc823d SHA-1: 9f45b837228de9871ec0180bb565af188b47f9e9 SHA-256: e4aba8d2eae08592cd6d2a14c25897c8e2a41add694199d44d81580210e237cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or callback scam. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to host malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document likely prompts the user to call a phone number in a context of billing, refund, or security, which is a common tactic for social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=pc+game+download+free+website PDF link annotation
    • http://sgyscom.com/upload_fck/file/2021-6-26/20210626162024864575.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160861cb47963c---49904626666.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b32bbb5729---libewa.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6f2766a1216ca2fdf97c5ee243db8cf2/vorenemupivojurorurabo.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/wusupapinevu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ko9evquvbo2m5tgogg3tt8918u/5123618001.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/30234407636.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/65516466777.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d1e83e74---14115892298.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/tcam4ufds9vkveb50i81jsu0fu/54693547008.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113f0e9ab179---42701290181.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/1225830459.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qqjumcm71uu5j8d667dgcc8lke/31494079370.pdfIn PDF document text
    • https://huanghecables.com/d/files/39334786643.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/fexiviwulupukifelifere.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/mazorakegof.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/molonuvabem.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/tigomepomalovuvezined.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086856ab76c6---risekijomewesuzigimapew.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/38585489054.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f991730cac2a5b5bb98eab200c2869e3/72986286857.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/midale.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc83e4e95b---90780201208.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/070qvkh8fduq91t0plni2etot0/kuzezemujosapuxeluf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903cb1a48b7---tepomawesidesuwesi.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_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 11044 bytes
SHA-256: 07d0cf14d2d090f18547a196cfa6fc9814b61a94a78778ff332dd8e6c1c3cd64
font_02_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 17508 bytes
SHA-256: fe0d8c0119850798036119839332565d6be2092406e9416b76a02300b93b54ae

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