Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52a0b6d2d6a9711…

MALICIOUS

PDF

88.4 KB Created: 2021-08-01 05:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18af8dca6da60cfabd0a30f58349f643 SHA-1: 15abc049e939294ee4b33f5443810df9e0fffd19 SHA-256: d52a0b6d2d6a97115a5f0a5b097780aee50765e4e6ee6ad3d8ced8b5bee56531
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. These URLs likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=did+they+solve+the+delphi+murders PDF link annotation
    • https://guineaservicesproviders.com/gsp/files/6689524485.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/13344060038.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/73087338257.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/38335189604.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/jusezu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/38162800703.pdfIn PDF document text
    • https://tappowine.com/file/xuxokirenomafegeresiziz.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/6vquj1riforjvn60n5nberh5eu/lunew.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2693e925---21105195736.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/88113874761.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e322fd441ede2e3e3a5d31e5f6587b2b/mefizowubibuzo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/55186876306.pdfIn PDF document text
    • http://blatt-gruen.ch/files/gidine.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160821be6084ed---18156048225.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b768309316e---zamovupuzawiwawaxewut.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/74098725387.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/duduvatesatoxiluni.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ja5bl5mv29p526k6kdpqroc3lp/gumazuke.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/19800257320.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/93762393299.pdfIn PDF document text
    • https://dineflon.com//files/25225693530.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/5102170306.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/tulolejujojo.pdfIn PDF document text
    • https://777mto.org/contents//files/nulitigolirukazikiz.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca76eba5f---43323943831.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_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 10672 bytes
SHA-256: 076309e9731eade947aa1d24a2b0a8e96e34d67a72101c59f80c977c967dbf4c
font_02_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 17040 bytes
SHA-256: 2a6b3524318fee7ae92d778385a9698d6174014afef37a7a694c2a9f73a78387

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