Malicious PDF — malware analysis report

Static analysis result for SHA-256 09497d586a52915d…

MALICIOUS

PDF

94.7 KB Created: 2021-06-30 05:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0442277a2d6686d9ff50878310b6758e SHA-1: 452a403e9f56ea6a22c1d8c82eae932baa8e5fae SHA-256: 09497d586a52915d8cb65179b3c153c8aedbbf575d43d99aba2e06dcab2873b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories. This suggests the document is designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • 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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a9d0350378827a5af00e987e5dd81153/2708136393.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081005706ed8---jusituvitotetana.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6339f1a234eb3c835328a9c18548b8e7/73509128816.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/87556396115.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9430f6effd1271a13acfd2006abdc8f1/50107810464.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fr5hu8rfs48f48ld163khnsq60/50787172266.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/33427685826.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ab2d5aa07f57c4efdd60dde18808794c/58548016341.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6621f5ad734fba2905498122495a574e/xawuredidanutakejul.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/linoge.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085410a76f18---53603347700.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/65ab8b1145a377b47cda3aae506d368f/51722711225.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/86682799581.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/4085d9f79f1e77642e520915acdf2322/lefewasawu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160934fcf66848---86422072530.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/wuginen.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb312af8c---2151784729.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/88746337238.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083986f5e205---64599789544.pdfIn PDF document text
    • https://songhong.info/userfiles/file/doranusavobesotegasupok.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/sitalowidun.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608400c46da60---53994131506.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210525164238.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/41815674107.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/jovugor.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8fb0d1b5---66162518752.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/58d99ab7af548f2c87420eb2154a8c0b/42589964278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=crockpot+meatloaf+with+potatoes+and+carrotsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000105c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x105C7 18004 bytes
SHA-256: 7a057793925cc44d5a36e2905c56f56930527548020d395bce525f76792664bd
font_00_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 18056 bytes
SHA-256: 54376e1e35f2cd3bc45d568c56d5835379793a3e96564daac0e348a6cc414c6d
font_03_sfnt_off000150cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CC 11096 bytes
SHA-256: 13047daedacc2e52898b26c780de041163337c61c6fa8c3b12a2cf57803af510

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