Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd7ba69bc4fd78d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 15:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 394678b14b531097b02d07f732b73224 SHA-1: bc74ed578bed42cff2708933f9e3b5a2182b7a94 SHA-256: fbd7ba69bc4fd78d71254adb4ff0c7affb981bab7cd05fa1a75920404c5a4da8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=gta+v+obey+rocoto PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131707dd19b2---94863312196.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a549491b8---zaviluzadebexogelovesifu.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/61921421818.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5b6817df4daa2a92b61c50f28444a9ce/48221745885.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fa22b6f9fff10a1fc7570d8e946b2170/tesunatevimiku.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/rifineluxepazuno.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/32291720730.pdfIn PDF document text
    • http://islandpointfl.com/userimages/gobepawatubazulixavopi.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/90378804239.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8fa4442c---najedelow.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/nigel.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/34049781479.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xetovobumizavineruk.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae3f85d5f---jidisi.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/66976451486.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/64992889165.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c42514db---40346385820.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/30418302922.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/tidutukidemetexamoz.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/18375601661.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/rigebetopam.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/29595806639.pdfIn PDF document text
    • http://midospa.com/upload/files/kukimopojusikanidifofe.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_off0000c53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 16888 bytes
SHA-256: 57a08d63859ea4d48dee885e303eb884e0ee5c0395230fa4dde78f73069ccf39
font_02_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 10172 bytes
SHA-256: 2ba7e296a3b7cf2a88c748116e2ac1be53df063ed2cf8c7d7def3216010fbbc6

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