Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f854c917b53bdc…

MALICIOUS

PDF

87.8 KB Created: 2021-09-04 22:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c08722fd43cf6d27d8001675c960c356 SHA-1: ee9bcb9f9b0bf8ec31fce641150e1a8bcc289f4e SHA-256: 60f854c917b53bdc3617ce966fda488bc18926fe4fbfbeb850ba20adfac5d231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to obscure the final destination and potentially distribute malware or conduct phishing. No scripts were extracted, but the overall structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=importance+of+information+and+communication+technology+in+education+pdf PDF link annotation
    • https://al-farh-iq.com/upload/userfiles/file/54905022703.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/38374581850.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131882f04c98---58509529378.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/dijapigu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/704fe8eb546b04246233cb6f86965064/finadowarobivilibax.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/jelijutu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/45a9925ea29b49781c66a4a68edfac01/dulilexo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98e14c0a0---20865216649.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/764cd91850592fa26017891481d27523/mivamomowenivavukugavediz.pdfIn PDF document text
    • https://medtek.vn/storage/file/72233898856.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/58403465223.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/girotibanefa.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/gadegodesapukojow.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba53b6ec67---45127344641.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/vojowofujub.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfea24468---38225578629.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ec75cdbb---buzokobuk.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/7937448493.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/jarinigobo.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/zanejurinodibi.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/86608090802.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/tamitoxixobim.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/tanuremikaromumokepig.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/91394575628.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879d2db2143---34835655109.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c866ddd5105---61417069389.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_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 11064 bytes
SHA-256: 201630cedf90582f25cfd0a633e8fd3c2ab63dbb91b5248a66f9e80ce1ff3408
font_02_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 17688 bytes
SHA-256: 33716b124b120f5d5cd91d9137ec1ea83305fe5a829be4b18c76368021ee05b7

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