Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f3c7fe53cc50c8…

MALICIOUS

PDF

89.5 KB Created: 2021-09-04 07:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50396e1b81cc6250370fdd55a386f17b SHA-1: e3b7a2cec1a9e8415bb981b4847a69b2aaab9fe2 SHA-256: d1f3c7fe53cc50c8a50e3fb080bf2e37b00d8c723bbf8ee92512f6c45776209f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=tangut+script+pdf PDF link annotation
    • http://weilandvloeren.nl/fckimages/ziroxof.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/figadopegiwil.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/vekafaxazasipifegukolinid.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b964114f15c87ba467bb2d32037cf2c7/16457665501.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/suzevenaz.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210605_115021.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffa713d626---libasepotememifesinago.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/97586786489.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/rqbgkqc2jlvb264t7apn2d2llu/95126411243.pdfIn PDF document text
    • http://esangsok.com/upfile/files/milolowum.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/xopope.pdfIn PDF document text
    • http://kleiberit.ru/files/file/xinatejaninawetojike.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/38548969783.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe82eb3fe---tuvakarawoso.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/50082028370.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xiwobizusonadixozali.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bd9192998---vesox.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e793d5de88---pezabuduzosevizudufub.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082446d07c50---pebitubuxosezesejalo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/016e9c13d17ae6ce1fc968fa46c1da3b/sifafimu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607171448c174---dojipab.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078434e5559d---masuzilafej.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_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 10560 bytes
SHA-256: bbad983e3a650a0550104ec859c296eafc6ba8b534cb24c1216b4440a02bee70
font_02_sfnt_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 22596 bytes
SHA-256: 1bf2b188bd4d86dd2a7945cd38792e15eb674448d1ac2e84d1f598d1a73f1af8
font_03_sfnt_off00014e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0A 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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