Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4d7ba082fe2ae9…

MALICIOUS

PDF

89.3 KB Created: 2021-08-19 19:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd99ca0f0911073d2247a4889dc8a20d SHA-1: 3d8140f08143ca2a284d89824cf6172564140c50 SHA-256: 6a4d7ba082fe2ae9e1218b78569464e8151fc2f79c9e857fb6a78cd1e59c09f6
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The ML classifier's high score and the ClamAV detection strongly suggest a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://eminenceconstruction.ca/viking1/uploads/files/guxamamurabasezagav.pdf In PDF document text
    • https://fonixkoncert.hu/upload/file/86574686818.pdfIn PDF document text
    • https://asiajitutop.com/contents//files/xifasofapo.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/mamitejegenixupuwiwokunu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//61951672807.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/zejafixitejapewudoravote.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f466620f640---84240749211.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/sj4ir9qlcor2tcp7oim1fgg0cn/wevikiponalaxagopojibog.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/befosepofonuralepekej.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/74d75db94cf0b4cb4cd73b377b17853d/fubeta.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/vokigafurujezetakav.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/nukemuga.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917de176b2f---82060222816.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/zapeketebupilukazijewux.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102c7779765f---womorejimapawagupupunisu.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/kejabomekimubazariwibodi.pdfIn PDF document text
    • http://martonelektro.hu/files/file/korilazinumebapifagijudar.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcee38398d---nofofuzumulibizatovuki.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1134bfe38---doziko.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ecb12f7a0---8300578726.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/vuxowiba.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ic79statg2rkoeavvk49kkrl5r/28346717878.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/41829186771.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a85ff42df5e2f6949136577a8cdd637d/45898977161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+does+failed+call+mean+on+whatsappPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 10864 bytes
SHA-256: f06b39314acb2ee092081f71b2e970bb9a48d254019480fa7885a710ac14a7d1
font_02_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 17528 bytes
SHA-256: eb5a70de5b56211e8f72fcba1514af665bafecd792898e12aa5dfc664803c539
font_03_sfnt_off00014105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14105 16396 bytes
SHA-256: 45647295bf3e6975917d2c46c854a2f040b6d2f4fa9dfc4d8f9276b78401693b

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