Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fe34c08efbd470…

MALICIOUS

PDF

117.7 KB Created: 2021-07-24 00:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76fe366523d3c5c9bb6f629b7bb33f2b SHA-1: f4b681a5d90710040925bb6e21fe8918e74ba04c SHA-256: 52fe34c08efbd4705a40b86b21db832b8792a20371a10fd5d37931e712cea865
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous links, many pointing to compromised WordPress sites or disposable hosting, suggests a link farm designed to obscure the final destination and potentially host phishing pages or malware. The primary attack pattern involves luring the user via a spearphishing attachment to a PDF that then redirects them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://muratay.nl/userfiles/file/kixajaraxurene.pdf In PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dinugevimo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ab3ca89f---domopejazopivijubez.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/61864394445.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/v4l4e4aao76rgms6uqffpukfn5/62903558816.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5621c4cbd---18348511639.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/95b279df06b77a732d04558912a27efa/kuvixoranosufovoj.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093df29aab2f---mibiduledu.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/vumisi.pdfIn PDF document text
    • https://tangente-mag.com/img/file/33714045694.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/31693597985.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/50716016800.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a6617e43f0760d04cc75e0fe8dd1e1a5/71569676201.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089013a9632c---31503180233.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/73567110201.pdfIn PDF document text
    • https://togeltop.net/contents//files/27004386775.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pijebilimalukexopi.pdfIn PDF document text
    • http://tsafar.ir/basefile/tsafarir/files/zolotu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/63582851787.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zumefumibakefigojuligaven.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/67f7c5e2e92766528f3c8a24750f8f9a/27359383213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=add+math+form+4+chapter+1+exercisePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/89533069915.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE2 10948 bytes
SHA-256: 4020b669f05cc5d0514422ee4390b48e7ff973998b4e6ba08e7547dd7f3678e1
font_01_sfnt_off00016866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16866 16564 bytes
SHA-256: 4b6d539893247d636700f2a63335a36d5e9a13fdb90ed12be51af8af47438e0c
font_02_sfnt_off00017ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000196d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196D3 18708 bytes
SHA-256: d6877a8eba6be4b4d6b3605b9a98183587dae9b505a99106cd38af8275ebb375

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