Malicious PDF — malware analysis report

Static analysis result for SHA-256 e658ce4f5732fb2f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-23 05:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c51dacf0b88c92506ef0e3e8a6cdf57 SHA-1: f8b193293a9ec67103ed4d1c14c3fdcad0d59f70 SHA-256: e658ce4f5732fb2fc5ba0551f4cb2e2ed0a87e290a3c8d7e29bfe176678b3796
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://mn-print.ru/ckfinder/userfiles/files/55510567986.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/31106455201.pdf
    • https://soechi.id/userfiles/file/4681801660.pdf
    • http://gammatradings.com/userfiles/file/65794557882.pdf
    • https://livnica-metalurg.com/images/pages/file/82295214910.pdf
    • http://conhantaoankhanh.com/webroot/img/files/76371942193.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/sls6n5tn7uq0llsmd4fcc0fbfb/kikepavovevukozudexewo.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///kutawuxesemejob.pdf
    • http://queenart.kr/userData/board/file/fupebosaxijoxobozuwu.pdf
    • http://cpgny.com/userfiles/files/70278424427.pdf
    • http://rmgoals.com/userfiles/files/59697741952.pdf
    • https://gifarlcm.com/upfiles/editor/files/takibuzunupinadowalebakub.pdf
    • https://www.paseppe.gr/ckfinder/userfiles/files/nutivomojepizu.pdf
    • http://jingyilin.org/uploads/file/rexulujodajuponutigevo.pdf
    • http://yule-sign.com/upload/editor/file/20210904053457.pdf
    • http://machinegroup.ru/img/outer/files/79428050672.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/wibavidakexiwobifisasuwop.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e9d8cf80e---nedebexepexari.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd40ecdd3a---99210243271.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613096c672f50---vuganozipunu.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/78118928411.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+studio+app+name+change
    • 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_off0000e841.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 16792 bytes
font_01_sfnt_off00010053.bin
a7161d3188d771225e16f005a871475b665feba407d5952b71f99c31bcee987c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 18132 bytes
font_02_sfnt_off00013014.bin
f027daf38d087aa21229644c28fca1c6dbaa67884d32558414e38f5438d72f42
pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 10996 bytes