Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc72dba8059d6e9…

MALICIOUS

PDF

86.0 KB Created: 2021-07-28 11:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d44e3458203bdf0e9793c5022a5f6717 SHA-1: 1a3791b95de8ddb86218984401f6eb090b501fb2 SHA-256: 6bc72dba8059d6e979a2a26177111604ddc5192d5352d42b826b2ccb385c6eb7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://peak-experience-japan.com/2054238010.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703033b64c1---44767386380.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082adeebe316---56139776457.pdf
    • http://krukewittfarms.com/userfiles/file/7384388572.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/q0nl1sa8av2oa0qpo90vi4bqra/62163066047.pdf
    • https://btegypt.com/file/lopapisejigekibedatakatu.pdf
    • https://alternativecarrepair.com/userfiles/file/zakiponet.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/c596deb0adm924leb7tpm66il5/fotomijelasiwobenixav.pdf
    • http://www.siposferenc.hu/html/lupowuvexa.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a1b84686---vutokikileruwosumopok.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ea5591e36---17911499970.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2a1cf44ca84b96752676fe2aedb2fce3/panavududemu.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b262114cb43---13825600620.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af927857686---zajopiminojal.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607731d44cc5a---24687227717.pdf
    • http://blankheich.de/images/uploads/file/sobogikuluxodamizazutuso.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/023f5ba64a747364ea13b8452118be44/29381104565.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9755d2b78c---44173206379.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcbdf64cfe---fekipedifikawifas.pdf
    • http://pospatrans.cz/UserFiles/File/71925911997.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9ca2b7c19db0156cb48920fca10ae997/48353529016.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/rojajenolilobij.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/63up6hfcel2mqfkohmgk891h7e/14523787280.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+change+blades+on+victa+ride+on+mower
    • 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_off0000ebbc.bin
7cc24bd46d7a027c112c33520bbff0b415fda3017489840b89b15e38fd6e3001
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 11100 bytes
font_01_sfnt_off0001053d.bin
50aa6ccf33333609c9417488eefc21933f8eabd41f9e8f60a79b343773524d93
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 17140 bytes
font_02_sfnt_off000131d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 16792 bytes