Malicious PDF — malware analysis report

Static analysis result for SHA-256 3351da6497520430…

MALICIOUS

PDF

84.9 KB Created: 2021-06-30 12:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b2214be7cf2e78151d071d8e7bd6a2a SHA-1: ebf615e5de99eb8120125b464aedd87b61eddce0 SHA-256: 3351da649752043085f44864a683ae610dc620d62eba5cc55a775902f0399426
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=free+spin+to+coin+master
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d67e549619f5a5d32d13b4ca7bd18ddb/70164883721.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/99138662135.pdf
    • https://dcoderesearch.com/uploads/dabodupuduj.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e8785713f15362b13be4cf72a60a77d2/42482052918.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/fcf0044bcffad8ca068cb17fce994c78/nepusebadiwepanives.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/342d3b52ee9d79be460ccdca606fe178/lodulilafibikijepud.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087825160289---renamiweloj.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e291c995dc8251e7fd853c6ff02e759a/6997318986.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a5h82veps8ic5m2362uocai5n6/romusawo.pdf
    • https://bosgo.mn/uploads/files/14232798187.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099d815d8185---69601979442.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3e7483a4b538a4ade2f7cadb9616e6d2/12988410641.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e18ad91259f237af366abd495f1f5ee1/neviwomawupo.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/zituxetopitizowifeb.pdf
    • http://moveo-sport.pl/userfiles/file/wixalezunomilirezutumup.pdf
    • http://twxcd.com/img-aim/files/jijenodagoxotus.pdf
    • http://zrdb-drogbud.pl/Upload/file/55387935140.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kh6v82slef60rae2hnfemqsakj/32203790521.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e4664c11a677a7676a27fb16189d8f10/22641393271.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071986ca348f---4844991430.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/935b2750004fa2b65fd0889d4d40a56f/81806989423.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd5e6f8ce---52943782322.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/78ebd507307ef6c95558251f8564feea/vumotanakawu.pdf
    • http://www.tekkoo.net/images/library/File/kopuz.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea37.bin
9ed88e59eecac32fcbd2368ae220d331565c4d544277ab88203f92dad5a8907f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 10468 bytes
font_01_sfnt_off000101f4.bin
03d0b62fbb55c44a7919419359e4489189e07b4b1765026cfa965e0099bc271d
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 16968 bytes
font_02_sfnt_off00012e33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 16792 bytes