Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18162ed4ce28b26…

MALICIOUS

PDF

85.2 KB Created: 2021-06-25 14:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b36707e73b031781e7ad61dba97cacc SHA-1: 74e57ca0288d91337100346b062195480cd3b463 SHA-256: e18162ed4ce28b2669d71eb5e9561810bb02d99b70a5d619c2765d532f06e368
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is designed to trick users into changing payment details, a common tactic in Business Email Compromise (BEC) attacks. The numerous embedded URLs pointing to potentially compromised or disposable hosting further support this, acting as a link farm to host the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://kmsenior.org/file/files/76842880207.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e9eb2d1349e9947d44c48fd86afffd74/goferi.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a204b5c5e00---48910044503.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a780ad84c48---94768973438.pdf
    • http://aaaexpressac.com/userfiles/file/judoboxap.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a1717113---tizesebovomadenewogufu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3qpiddp5m4tb977fspinpl3p7d/71615045168.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e663a683c---jesevozazibuk.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/339cc4d0ffd3305058f33309ec4b4ad1/67678749546.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/fbf2092e720564a76fb7a09ef5de5946/23844076866.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c8a845f8d---15509484160.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1b13e6bfc4b9b4570df6a88a25318266/pabikiratetidevonona.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160916e1ae40c1---23203578461.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=roubles+to+dollars
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb60.bin
b97f3c650e7ee45b949d6568458cd51ff504cac19578e3ef866ed5a2769fd888		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 17536 bytes
font_01_sfnt_off00011925.bin
21928f640ee877fa32b2ca6c8be676335aef331c199567a4fef025eff814788b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 10328 bytes
font_02_sfnt_off000130a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 16792 bytes

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