Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4d4e2c4e943f6c…

MALICIOUS

PDF

95.4 KB Created: 2021-07-13 10:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 575a2606849fe4de1160cd2a97e6614c SHA-1: 1225e4fe63f7db0ae7cafafc1e576bc90d91352d SHA-256: fb4d4e2c4e943f6c22f582b68768e026216124bd47e41c0e1b590d30364f2e62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which in turn may host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • 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://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f6b036fc55ce2c3daedd003c1bb07904/genexaramokatosalusizo.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf701eeb6---11005731125.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ihouhet9n869clj2lark3tico7/46491057435.pdf
    • http://mnogonomerov.ru/uploads/file/99218611415.pdf
    • http://esebtekstil.com/resimler/files/nedafiselemuzitedimura.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/a46c4c14cc9b77565b7efa91ab3df75f/73922372063.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf417e33ace---wubugeguxifokubinikutudi.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e25a0c9731a059e189ef51c297f84400/renaxuninivirexol.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/lelixaxafakadater.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/dujapudu.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072897d124ae---kujiweb.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/gspm40sunbi6d9s8r28re20e5b/rinevapabunazolefebenab.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c719c642cb74b40b1a817cf3b2982218/68073716586.pdf
    • https://dodatnojamstvo.com/userfiles/file/robogeridowowivexepab.pdf
    • http://weighlessthisyear.com/ckfinder/userfiles/files/86835892993.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ot7995mtdnbtosv8tjo4qlpa97/vebamawe.pdf
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/waxujifitogopod.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a07c50b1---60911638251.pdf
    • http://atomleasing.ru/media/File/37563754048.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f6976f28---48364217219.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/5b471beb68c000935ca8d64da128aa82/tiredaromedewiwupojul.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f5e5610d02736e6b4235d4537afa48aa/gemolomofizopomivug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=labour+laws+in+india+2020
    • https://rb.gy/mkp1q3
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000151f8.bin
63e1e833bb46cc3d655d10ddcbc6f6536014c1855295622c567f7d50f49c9917		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x151F8 18596 bytes
font_00_sfnt_off0000f624.bin
c15fb9190a2ffca6d20221103cb1cd72e77ea19c187e1abed55beda53aaacd29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 10536 bytes
font_01_sfnt_off00010e45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 16792 bytes
font_02_sfnt_off00012657.bin
0c6248b1139a5d8104c9adbd1521e773c7297b3c36d15eb5f217b169277960f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 16696 bytes

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