Malicious PDF — malware analysis report

Static analysis result for SHA-256 198e9a38e6c8aafb…

MALICIOUS

PDF

94.4 KB Created: 2021-07-24 20:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5125153aaaa0deff510a0fce154e98ad SHA-1: 4650f40e314fa0798a418dc4faadf0cfaf76b9c1 SHA-256: 198e9a38e6c8aafb30a5a34ec72e0fc317e00e34c9002f326e3f03b5c93d9d38
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to lure users into downloading further malicious content or visiting phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e12d6c321398e1df0732910d212100f7/16593640768.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079754754684---wolagokotovanada.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160788f0de036b---19520695404.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087572c6261c---85464811453.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9cfd31c26718f597278ae739cbd074a7/divex.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/deladeti.pdfIn PDF document text
    • https://latework.cz/soubory/babelunigezasi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdg7m9bgn74oi6783kcgr6jma3/rebowuzepaw.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d9b7eb4f---65440691705.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc9042a83---93672894796.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///mekerijuw.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/51051388705.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/molanevosife.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a288e151750---jetazefa.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k11fkd2bm1ao8hd58gg7le3iv9/97915702298.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721dc9b80bb---29902571574.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5eafa12a8---78143774238.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/572a97052de8163c07f895f45e5238ac/lukega.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bedozi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2881a60a324fd2c93c6a1af42dcddf68/datubabozadig.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c8033fcb---18279103194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=two+ways+to+find+major+and+minor+scalesPDF 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_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001248e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 17468 bytes
SHA-256: 623013d351d500b7a806ea7e2c50a08ad08ef615a04620d73766aff652e12040
font_02_sfnt_off00015251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15251 10928 bytes
SHA-256: d60fac2e312916ba31c15e67275dc69f213ce3372b030e88516cb9e7c6d249da

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