Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb956d67fedb52f…

MALICIOUS

PDF

102.7 KB Created: 2021-07-01 14:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad61e8cedc7354bff27d28d4527b597c SHA-1: 81525de14db0c7719b0db68a117bac2937ff19fd SHA-256: 0bb956d67fedb52fbbb9515e9242534bb6475029f546cc11ccd9171bb51ee282
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the presence of a link farm strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://garglob.ru/uplcv?utm_term=satcc+specifications+for+roads+and+bridges PDF link annotation
    • http://anhbanglaw.com/userfiles/file/99269267868.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bcdb04911---72761129252.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/pp7okc21pevu6cicu2ukmagi7p/befixowopabukotufolinug.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/2fe79715f4320a097f1438fdabcc517b/robib.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a53335b1f5f47dcb48028ad61d2bf302/fatovexegejafix.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3918a7e9b4a48ecdc4dbb22878c86889/dejoxuxukederebire.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/rewumuxarovexanorew.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d3493e8e0---79030912982.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3q1o393h149oc9563pl3ajn572/23299396332.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/makigaxixi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8cbbcaef6---rizolugu.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/dategila.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec51dc067---6531369795.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/tolud.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2s4ha27bjaorsps8aq5a6jo422/zelabomavinulujalizaropa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0ggu9t2t786p30hnebhtd9ig0/54332037745.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785384092f8---17402190897.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfddcc14c0---89030824388.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/tunolaroturikuviduwemagam.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517133533253608.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/tubesukowezeluru.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471c3e4fd3---26693786502.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/dogemelotatijimuvej.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 8052 bytes
SHA-256: 2a100f54b522bb0a6818cfa43a0248db6908f8c3b22e16b11e7cbac9e9f83c32
font_02_sfnt_off000143d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D8 10964 bytes
SHA-256: 3bd33d5ff47f9c32d012045568989c512a26aba907aa4022d23be4cbcac5b2ef
font_03_sfnt_off00015cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEE 17500 bytes
SHA-256: ba72ad9fed2451a950fe8dc5aba1d0d22afe0e2954c0a7b089b47caf2c12a61c

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