Malicious PDF — malware analysis report

Static analysis result for SHA-256 c726b478d646e71f…

MALICIOUS

PDF

87.7 KB Created: 2021-07-17 20:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 96607babba7313ec8aa141938ee97d9f SHA-1: 92f9368ea75d9eb732dbc6dddf1d31d3e7e93180 SHA-256: c726b478d646e71f44c2f7642df5be524cf81a3b3b118b9d520050ea691d1325
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to host or distribute malicious content. While no scripts were directly extracted, the nature of the URLs and the detection names point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608405fbc3742---79983971311.pdf In PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/958dba1636d7959fc7cbca5537c38c11/81061940526.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/rikop.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zukejed.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/tikigiwudatidozotuna.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/33394180089.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0aca9f00---zilegujuje.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36bfccf12---21547327663.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b5cbb894f8230da0d091ee48b3b3a9df/42514975773.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/39823802643.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bcbd5e01bab4c0bf3c06f7fdfbb5578a/81154344054.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918fb1bc683---19215068474.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/7528037895.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/54545026321.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9921156bbe508b302703ee0ab0ed98d4/mexumosulozikabalived.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/rufamezasofulevafasox.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ff40c69077342b742734c63511ca078/81149277123.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/furapawijegokimubiwaju.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/64588471452.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a48ec838e---welugolapodinexuji.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/c02obl13s931bu5o8irb1d5es8/64189272824.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c261c688d50---nutomokuxinow.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/6781486870.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210601043629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jesus+is+the+armor+of+godPDF 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_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 16396 bytes
SHA-256: 85a719d4c181be618980b9ae2a080015fae39932f1af0cc56ddecae9b3366699
font_01_sfnt_off000120f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 10744 bytes
SHA-256: 78bc0cefc765f4b611ebdbe34db1c89cbffe75af859049845bf8d8ba735d6517
font_02_sfnt_off00013986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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