Malicious PDF — malware analysis report

Static analysis result for SHA-256 138a12eac8066350…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 14:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55aecd2f2242e391af8bd33ec68d714f SHA-1: 52a1da558ec2215e5f17eb7e88059182991a8f50 SHA-256: 138a12eac806635051a5794f2d794d36159fda934d167525fd4bc89b7fd99666
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to obscure the true destination or host malicious files. The presence of these elements indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fkm-lux.by/var/upload/file/12548785040.pdf
    • http://coca-colalife.eu/userfiles/file/pazosuwodotamotazad.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/7675261663.pdf
    • https://thefertilizerproductionline.com/d/files/midita.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/suruligaf.pdf
    • https://praktijkbinnenstad.nl/file/norezijerobipas.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/00388d5c100c88fedc3aef199ac3a1c7/gamejojazagiluwofek.pdf
    • http://krajinar.cz/soubory/files/401696486.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/67110530129.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/75824776127.pdf
    • https://pensionradvanice.cz/res/file/deniwesurapuzimozo.pdf
    • http://kozhencherrymtc.org/userfiles/file/17412162752.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/163208890265.pdf
    • https://istanajp2.com/contents/files/80058276737.pdf
    • http://cementfeet.com/userfiles/file/14783849332.pdf
    • http://prosefkuchare.cz/userfiles/sojolowafavudubexaxipeb.pdf
    • http://tulga.ru/editor/files/fetezuropeku.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/454b32c39c1d2f5553e4f7375252779b/4219485067.pdf
    • https://braindevelopmentmaps.org/userfiles/files/jufomimikalutez.pdf
    • http://familiegravesen.dk/userfiles/file/96387578198.pdf
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/gafoteviwosesolusexogo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7ba6d6a9be322ba302367ca51bff48f5/64404102552.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sanchalanam+telugu+full+movie+watch+online+2019
    • 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_off0000adae.bin
66e7d48fb0d63bae4cb0fea27b95c4fa3b3001cee37ccb77657d35c38431e562
pdf-font-stream PDF embedded font (sfnt) at offset 0xADAE 11304 bytes
font_01_sfnt_off0000c838.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 16792 bytes
font_02_sfnt_off0000e04a.bin
fc86dc1992f57e5b21d028cb32a1603c4103134a77ba6df9f9a63f4c275a31a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 15212 bytes