Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc88828738e98baa…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 22:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c115c93c7200233103353bb3e882d846 SHA-1: 9849396d002f0925205dafc56904d182f2e518e7 SHA-256: cc88828738e98baa2e9dd79ead9e431241d408e797bda89d499c6377b7d96ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farms pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=foseco+foundryman%27s+handbook+pdf PDF link annotation
    • http://altaprecision.com/userfiles/file/96641652117.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/kiroloruxobovapoxidina.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609972a43d257---lalewivevodezogolin.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a490348b04e---50322734283.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/vexiki.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90e4c9d0b6879fb0738e40e237afbfef/fosiwikepigaribuxig.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/vowumabaxalotujagugabu.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/pivefagaganiset.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083525b3d7ce---xuduwusekokoruruxexup.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/37338885528.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///16004469453.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ee961d64d96ae01a218a1a8c50b1a27b/85431999625.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/6jjqng01ui2ku9e9qf4fc0if00/19580185295.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116317c19ea8---33481580548.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pokqpfoabr6745617581mr05ck/52936298998.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/wabugotovulufugugebo.pdfIn PDF document text
    • http://spbi.cz/res/file/kigegapadelod.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b737e7f18a---69156741732.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fcc3cd2d0685d1b8a6e67a8addd5cc5/rusanizavobubuwunim.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/vajufifevujeb.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nowowidowesudejabufotit.pdfIn PDF document text
    • http://malifer.hu/upload/file/rufupotejezudosox.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/487c5ebcd58bd35503b605ac37fe5f3f/tuvosujozikigixojatevuru.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/migaju.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7760984b---40965459672.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 11108 bytes
SHA-256: 1a88ee84ed7747005931788930f52b7889a21ed5885ab0e93916effc5e42657f
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 17364 bytes
SHA-256: 7ee048dc92462089aef009dce356490701b149ed0637399a256433daef4d08a6
font_02_sfnt_off00013522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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