Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda023a2238b17ae…

MALICIOUS

PDF

83.2 KB Created: 2021-07-13 13:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7d29d8a994bc0b2199769876de5280af SHA-1: fad901b0492c5e68f2cd4d8bcd620f5793637c91 SHA-256: bda023a2238b17ae4dd434c310295dbea7cd8a0e64feb33b52327bf8640d1866
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and a raw IP address, suggesting it functions as a link farm to distribute further malicious content. The presence of multiple PDF_URI heuristics indicates a deliberate effort to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://assessmentinsight.com/ckfinder/userfiles/files/61016176633.pdf In PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/eac1969c4d813ec1f3965a0e54ecd041/48736886185.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/20774fb450a465cab5e557b40ce85882/zuwofipet.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lsme6s0l63cu5873uokducen71/dumalule.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16098eb011fbc1---fadel.pdfPDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d36bab19721---29988422599.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1bb0d55c---tesawuwodoposozukofena.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/90727508753.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/kekubexuxugubeg.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932ffcbc965---pesixopimivunamera.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/41078081091.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/jenibijorunazikajuruz.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/26426712559.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0fa56fdcfa5c495d9c6129f06842305d/bukeremumit.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4054c4d5b---49675598117.pdfIn PDF document text
    • https://studiorampinelli.com/file/78457631467.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/720246f82bce2bcbdca14126d3d3fc1c/87590623882.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608502f07c144---46416319824.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6hvfffpav0f0654li7agapef57/33973557442.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/28080906446.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b592e78cf---87317230181.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c26c65ba1c8---72502785228.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vasijepedamogoref.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/refetogib.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160902478a8efe---48597899645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rs+aggarwal+class+9+chapter+10+quadrilateralPDF link annotation
    • 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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 17400 bytes
SHA-256: a584d20d4c6c5730108a5233934e65a3985cfc036d9dac03fbe0fb10195c10b1
font_01_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 11288 bytes
SHA-256: 0b28e98916e5efce01e3bb1ce42cf20bcbf05b7f114ef0bc5b592a0125e20de9

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