Malicious PDF — malware analysis report

Static analysis result for SHA-256 db063f099cb63358…

MALICIOUS

PDF

90.6 KB Created: 2021-06-28 18:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3d03362058a27d6985f7851bff46646a SHA-1: c75cdf98e081b9afa3c7a0d36a5fb38332043323 SHA-256: db063f099cb63358684e1138db363230873c53aecaf6f95ab51feccb613bd249
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The presence of multiple links on potentially disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/eadcb8fa75fc28890c53f0dc273466ed/78825350922.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/421a20be92b0a050712f72f7cec2e35d/10583953334.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/lejalulumirap.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/21298037867.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbac58e178d---fuwow.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051518321579.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d1a33fcb3e3d27a32901713918f533db/jisimodetuxipigisu.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/58154140461.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fgtc1mi09gal1d3h1okvskikl2/74887025013.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/xadujomowifekod.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92974314315.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98f89d9f08---93829879056.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/givuzawulujinemepa.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7c9e558867202834b5fdcf9399ac9b4d/xezuvivuwojixo.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/barujuxolopukaw.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/26687771066.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/6533841792.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/41d8297869ff5441ff159b3ca3c6db79/buxuriwojodi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080db0f390c9---36740621465.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/67825550982.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb22c61d1a---lufewaxo.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/guberejaretuzuberule.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/mesetemejozad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=first+guest+housePDF 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_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 17296 bytes
SHA-256: 10b77e6bc0c61e086f186bf249f535121cf855bf00f3816aaf4ad5c082562a70
font_01_sfnt_off00012eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C9 10152 bytes
SHA-256: 6859c233862a2149f5a1cebfe94f20447c3af62ccb3c998ab092ca7ac40a5e9f

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