Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d9dbf97b01de11…

MALICIOUS

PDF

93.2 KB Created: 2021-08-05 16:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7c2d3940eb24941ba9cc532863aafb2 SHA-1: 9aa161924c691ccb32ab376cf067c1239984884f SHA-256: 22d9dbf97b01de11e2ed540d0c3b6558d0032d5addd7aaea18d26bbdd990ee73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but no direct executable scripts were found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://rlmahtani.com/userfiles/files/wusesufenerimiparitejiti.pdf In PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/zuzabotododotizetataboz.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/8902247848.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/28491601221.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4827d4f1a29d4fcedc0c470e6ab7d639/55580418929.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/65795880325.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/gevukike.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/35354790631.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210720045135_814037000.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/d88cb98d76880494931aa46f517961d7/jasubego.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefilafuxurik.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ri83fgiuu9c7t3irios0f32mai/35188374409.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ea3eddb0a---55860947285.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/84kn2362gcdnm86o1cnih6piu2/kililinuxatowizamo.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/zotofudekifewiwexabuxowes.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/31572783340.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/kakitiweru.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2418f7e1---38976125730.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/4tsnmbc6mhrhepb47rhh99coe4/87153923134.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf997b580ad---8709966451.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b556729450---63448181736.pdfIn PDF document text
    • http://millecolori.it/images/file/tovononezijigakevamur.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2563f54e0a874b9be5bc1e16b0099d56/pugaliwora.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/burex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=minecraft+skins+brawl+starsPDF 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_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10520 bytes
SHA-256: c4efba8aeb02ac70a5930f4322b19e64df5a804c8e0c881a72fbab0f6935ddd9
font_01_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13859 16984 bytes
SHA-256: 61ac706abe87fae398b932a380c17b957b94c6c8c4f2c3f4c3e6739bfd0891d6