Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba2b881529fe227…

MALICIOUS

PDF

90.7 KB Created: 2021-08-14 03:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d5b5fbe7c9cbfe438a1a18d3c13040e SHA-1: 9734cd68c00fa205946b519b110f9ed454959626 SHA-256: cba2b881529fe2274dea5606757a562e7bf0b10b96ba22d7c60ff2eb33c3486a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f769733cee---verajojojakesuki.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbf7cb9ed---sixirovirusilewamixi.pdfIn PDF document text
    • https://aedwea.com/upload/foto/xivabo.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/67227022281.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/14572476944.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qs854u9dv668gcg53t4drm91d9/31298443180.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/29242923280.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/20209640558.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8b9264d1---46734457980.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b164cb5f---85927140424.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/88491319018.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/61655414440.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c3b11feaac84dddd1e399428173a2d91/lajutixuxevefub.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebf170d35---vovakikedupeduvudob.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5fcd5fe94---30155360071.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5e8c6694---pelisefatesisudewigigow.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/wokejivabube.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/37701606995.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609122caf2f2e---zavivetopidebaj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878998a8b91---xuvizuwojabozelobigoviba.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/21491834526.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/samapimujeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=facebook+remove+all+friends+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 17732 bytes
SHA-256: 5a5664f02218aa8aca2afcef9cce13aeb52a5d06a6d4ad08336d209e41ceec9b
font_03_sfnt_off00014263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14263 10956 bytes
SHA-256: 912cef4dca425b5064cf2688f80d904ef913f1ddca22eab0f43b4cd6e881ecf3

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