Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddf5058e7c161e5…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 10:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d3956b45383a05b5e955afb15caba99 SHA-1: 69dbe1f4199157fcddd01d086c64eca87ce1aca1 SHA-256: 8ddf5058e7c161e5864b557d190702ade8995d9c40082fa69127101ad507a1bb
176 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or scam lure. The document body is heavily obfuscated, but heuristics indicate it contains a callback phishing lure, prompting users to call a phone number in a context of billing, refund, or security issues. The numerous embedded URLs point to compromised WordPress sites, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=west+virginia+regional+jail+authority+inmate+search
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c1494ab99895efa58662a7cef9565e2/kakuvizoxogobixade.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8080e4bc7d---37336381379.pdf
    • http://asja-doll.ru/userfiles/file/96148458577.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee02b4446---98472465255.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c47a25d0e368f2b47d252cb4b16136b6/malowofezepavogowa.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9ca7ecae---16156234881.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef29a66ab0cc1ad298c8147fc0725c5b/jufifimitatikanubefu.pdf
    • http://agcslohian.com/userfiles/file/83127435058.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/t0mvino7u79qknarfeejli0nbs/73115718265.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e776cf6d77c6a0606e3d92a494752ebe/vugapikug.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/d53d5f4a429f3d09bf687a293f9bc6a9/14882091701.pdf
    • http://mpti.ru/userfiles/file/rodosabazufunexemizemed.pdf
    • https://akproauto.com/nbloom/fckuploads/file/27688766736.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6b0647129ece05ef73a0e219ec0ca267/lerowugesunada.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8e95ecfa---sabetawamisopawa.pdf
    • http://xlsferrosilicon.com/d/files/39050707732.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b5a679aa---21308609292.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bin83tk0n4ab419hk3dv0nf700/97194310045.pdf
    • https://congchung7.com/upload/file/xobisamikaxida.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/nelavew.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/boac4504ih1ndvmms1oe7bacfs/zunazujezadufevawupuduv.pdf
    • http://daonshop.com/files/fckeditor/file/nexibila.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da34077d23272c436793a10682e2e6b8/9066881603.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e7c8182570f21aeb5eeccbc2a61d1bd4/77998176871.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27e1df9f9---wisalemefupakitizuj.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_off0000ed07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 16792 bytes
font_01_sfnt_off0001051e.bin
90dc8782e4b6456e38a978957e6bd22283cfac22bdcee7d8c356a58c81b82f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 11080 bytes
font_02_sfnt_off00011ec9.bin
6514248115f882e375028b9cc02d8ceb8f2b2f3652030acf9efe4184eaa6f506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 16504 bytes

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