Malicious PDF — malware analysis report

Static analysis result for SHA-256 601e99eb1023d54a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 09:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 319cff9f1bee805af6f899460b4bce55 SHA-1: ea25071c1d98dd123f79d7fa30383f0720c2b6e7 SHA-256: 601e99eb1023d54ac7e03d6b63c9a305bad443b620fe51f9742d4592a590f3a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sunarchegypt.com/userfiles/file/78958366478.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8bdf247f9a18f2a95b593e3ca1a2b691/76459466726.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kb06v1vil1eenahq5meb35rg21/zadaponubufibesovisoraj.pdf
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/jifalufibubotipujupunupew.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/lezusosejifenokero.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3d85a21e0e3aecc825ef78600685112e/xamunagigag.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f980dd9084---77038833469.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b0844246fa86443d4e3273912c8c2ad7/94075091345.pdf
    • https://georeno.ca/userfiles/files/30424282610.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16090816090d1a---74183281037.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/210c3121150b0ce4fbb199f646c8c290/bagagaxebirojojesavir.pdf
    • https://liniagdanskzydowo.pl/files/gifopejevuboxaxogin.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac544ae4df8---sopejavevifoziwi.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611406a13a55a---subuzesijukojeru.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c308531c885---50302033526.pdf
    • http://fc-junajted.com/upload/datoteke/kowamerajes.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/19122196383.pdf
    • http://drairtools.com/ckfinder/userfiles/files/pogoguzilukafakebegefa.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/49179144325.pdf
    • https://rjpexport.com/files/38404580746.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b2dfc1c6ab1e82f7a3741e08b4b8fda3/29047885421.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/04fa4e44d41f7bcf218ddbe38002ad36/jujinosinizod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cryogenic+engineering+book+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd75.bin
e5c6e3e0a834cff8f7aea37b8b7d0b34aae878c2c803366e9307d3000a2e92e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD75 16308 bytes
font_01_sfnt_off0000e62e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 16792 bytes
font_02_sfnt_off0000fe45.bin
b25efbb1bab19169220cf8cbaed5a97391987626628a5b1b36a6144af4f924a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 10700 bytes