Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2210e478c86aded…

MALICIOUS

PDF

122.5 KB Created: 2021-06-25 14:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 363107cad5f54b248e61e565370b4029 SHA-1: a56b4ce44755ee51ca1edf2710d8142191fea741 SHA-256: e2210e478c86aded92e33afbfb85f857db59a64333fa003e645bb4dfe0bc1101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=runescape+ranged+leveling
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb22a1713---82168539224.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c048a1ac09f---xiludopelejufin.pdf
    • https://nepalimodelagency.com/userfiles/file/rebewow.pdf
    • https://proxus.nl/file/90608683880.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2272be2f63d32f45d1ab3207eb236620/10576498506.pdf
    • http://ventilatoryzlin.cz/images/file/kefom.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/tndmga14et6fejdv7t4j935836/86782880297.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/78ad1db198fd10dbd2d3a67dc029a292/lifiluromivu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a4c2d26c081dd51e6ca0b3884e211f11/44243520725.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/fs9eqegvukklsmrpfnkc3f8ko2/balejixoja.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160790409d2f9b---dazusiledabelulipapoz.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4e78625f---2612180659.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077db75daa66---80294252035.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e01c3729e---wigipipifogapixadifukuza.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cbaaea2489013d09a175a33fa80db45f/loxejekimojituzopigula.pdf
    • http://a-kamen.com/userfiles/file/zanobag.pdf
    • https://alteanetworks.fr/img/file/nobafulolukubesero.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_off00017dfe.bin
8ddbf2e6e28034c2fc647e847139b945d52fb1debbab0c2f33cf590c444ddf38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DFE 10684 bytes
font_01_sfnt_off00019662.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19662 16792 bytes
font_02_sfnt_off0001ae74.bin
b0d510e710a78fabcec9dacf37ae48b35e854739df609a44d7595183778eeb17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE74 17324 bytes

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