Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e644490e4524982…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 00:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a2a98f6c8e9ca84443f05cb22cf1bf1 SHA-1: 37146bfbd01be4fb6fdc91e5208a6e92d5a66c4a SHA-256: 1e644490e4524982ff8f7c7ade57fb2f932742f5f33697be36c0be1d297d383f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous links to external PDF files hosted on various websites, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute content via numerous low-reputation hosts. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/083bf1f24f139a7491ad370d528b67f4/77485783591.pdf In PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/88207534252.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/50929537954.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/65849662088.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/91104281368.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210911090252.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456400b56e3---dejep.pdfIn PDF document text
    • http://cke.hk/userfiles/turubigutasuruna.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/90078444534.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dubiwujoxuwo.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/97552551157.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/84784247619.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/bonimedoxoxuraxad.pdfIn PDF document text
    • http://foodchemsino.com/d/files/gisukenekuminizumureg.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/wulofebobumejaj.pdfIn PDF document text
    • http://amdind.com/userfiles/file/rumuzixizemes.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fbcc3ad116bf1b6a45928ac28eb614be/67377204226.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/53441663095.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/mevetegiwajupirutak.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/71925398929.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/98635896301.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/67477157399.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/fefexuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+transfer+things+from+android+to+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 17456 bytes
SHA-256: 335140b20d8bf083ce772fb254e66bfb208c5ebc867d6c0d619d3cd6768beb47
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 10832 bytes
SHA-256: 25413fb173f0d5c66dfe1ee9c0a1e3c2b140d516e9bce5890c53e8bbf534148e

Open this report in the interactive analyzer, or submit your own file for analysis.