Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97b16cfe5ed52bc…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 02:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 189c31b6c753f071be247f8e9d223644 SHA-1: 153e6b541f96ad7621db7480bf29ceb52a4f626b SHA-256: a97b16cfe5ed52bcca45fe793d3ff1f64e573ebb328ad6cb5d28a80cc5e3920c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL findings suggest a malicious workflow designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=jurassic+world+the+game+download+apk
    • http://global-insurance-broker.de/downloads/13509948657.pdf
    • http://cedule-plachty.cz/files/file/vokapusutajonu.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2e6bfbe3894c00e4849692318712c83c/kisetudojujenoz.pdf
    • https://bacninhonline.com/webroot/img/files/vazoviterokusogesemez.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082635834b33---89696459710.pdf
    • https://ozmutludokum.com/userfiles/file/51741576656.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af59f350ad0---detizalawis.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077273bc917e---lezogurokewadixuwuloka.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b7e36075f386bc227ce29964be6ebc19/80949822156.pdf
    • http://churchtextile.com/userfiles/file/72907717886.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6ad898f6241519fac31ab57b19ef81c6/44051487008.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/smojppcl67i4vjo0662l10mrsr/zorekobamojidigika.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609126f5d7986---jugigomuxalifesi.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/02ad2838835cbdcd2cdd1cc898f3d7fa/vovojudo.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/343fa20eacdb57328ca282b723a38367/vasiwokubawupadapibonajo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160732e020516a---59080792640.pdf
    • https://bataretak.com/img/files/file/rurofesujujunuvovefixox.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd4343636---komoviruporubigod.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/74263b39a33430148f0a9ec6ca789573/sisezokasawe.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072427f6aefc---18975581086.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080546b9a3c8---78771355055.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/fa27c8a266947b723366fa954106e5c4/zebobusetufofa.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/74bd8b3b0282ec95f67f62acb59fec6f/supetikonib.pdf
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nomek.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/2632195016.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092efde3504d---gerudisixep.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_off0000ecfc.bin
8a8e5ca72e459c604595e751f61375ea22c10adce55746a251863c90bb6decb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 11228 bytes
font_01_sfnt_off000106f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 16792 bytes
font_02_sfnt_off00011f0b.bin
c148ab37005fe1c7c454955dad7051774982a73f3c455c9a200414bdad069e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 17404 bytes

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