Malicious PDF — malware analysis report

Static analysis result for SHA-256 7426c9b02807ba93…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 06:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 619389ad6132f7c3eedf118127c6b8c6 SHA-1: 63f89b385e7198404070607689efd94cd7a24bbe SHA-256: 7426c9b02807ba938e1ea260973173d19a3c8761138513afd5bff9c400264795
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a malicious intent. The ClamAV detection and ML classifier further support this, indicating the PDF is likely a phishing or malware distribution lure. The embedded JavaScript is likely used to facilitate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dailycan.com/userfiles/files/ravoziluwakizomedojeme.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc02b1f8c---mememewevotulafokik.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/88928649177.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/dmlgp9cml814iblf0mq8brfhf3/patebevokuxotoxe.pdf
    • http://vertex-decor.com/userfiles/file/vitejituxapijojiro.pdf
    • http://sunmoon-glory.com/web/upload/files/zavulate.pdf
    • http://pc-driver.ru/userfiles/files/35824235440.pdf
    • http://baozhaopharma.com/upload/files/94406949168.pdf
    • http://gostinica-domodedovo.ru/files/zigaw.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141d87f0857f---7681383111.pdf
    • http://musclecar-taps.com/js/upload/files/sipegisepuk.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tokekuxez.pdf
    • https://fcksa.com/ckfinder/userfiles/files/98917648737.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/rapolawotexom.pdf
    • http://ecole.ru/text/images/file/46213986087.pdf
    • http://www.rpv-drachten.nl/files/file/79587747821.pdf
    • http://erbaytag.com/resimler/files/22715131755.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/76388461167.pdf
    • https://titishop.co/upload/files/zolaxaligagasizavipewuvas.pdf
    • https://safrano.pl/userfiles/file/walugozexesirofi.pdf
    • http://zdrowejaja.com/Upload/file/97958393812.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2m2608g4toqhn2f5lm1m4ereho/sanuxotijuxabozivegin.pdf
    • http://interno-kazan.ru/upload/files/63548382825.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/111cbd5d5c53707cd0355f5eb432bd75/vegadawisetigokoxe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=firestick+sports+apps+free
    • 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_off0000be3e.bin
d4c2b9ac7b4d9521488e9fcf8ccab6a8027df7e4e34bd19b43097c87e9534d0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3E 18632 bytes
font_01_sfnt_off0000ee0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 16792 bytes
font_02_sfnt_off00010623.bin
379981427889221d2ed42762259e4c1439bf0eda5e6b9b8e27a593b30e06f615
pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 10392 bytes