Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c6bacfff7baaa0…

MALICIOUS

PDF

80.0 KB Created: 2021-07-03 09:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b0fd6c779db08e0716c25478f400689 SHA-1: 561ecbff6620712385466b14246cfed54d39abb1 SHA-256: e3c6bacfff7baaa0b43fe0a08b79a2109ea94068086911f6e58fea58bc795026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of external URIs and link farms on potentially compromised hosting indicates an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4eac1e4824f8ba0ca8f826b49747d66f/78182486082.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6ad0b0745---sinusatovulumedo.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079066f5d1c4---90822337961.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9df36c791b0ac1b7cfb1b3ef00aea122/20510163870.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160783e652160a---tazotul.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1dbc8dd3---fiwoteduvurewizajix.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/leropiputipuso.pdf
    • https://mosconi.net/userfiles/file/linapowizak.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/bf0404e17175d9bffdd8b8145a29170c/61943380809.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ga3c8i0mgn0nlmg174d8jr82pm/88671861895.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241c79ddac---43442363351.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/304601206b63902edc881a6eb06017f2/dugarozisixapap.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jt1lbqudn5nfk1u3gt0vc8182j/41683010675.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9c652236---2104162306.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/js91fkkicv4n7ohbngmu6snibn/551328047.pdf
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/jozosewexif.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/d82094b9274bed230c19d6bdf801a9c9/80692118151.pdf
    • http://santeh.md/img/files/66301535198.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b9197dd3---14431776932.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fbab46975c634a08ae4e930aeca7f963/58369809446.pdf
    • http://seamcc.com/UserFiles/files/zinevakosubosadonitare.pdf
    • http://linkingpeople.info/userfiles/file/xupumujelunuvonuvaxupid.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcb7lfm08cs7cpjeiqi1jrph43/gipugajel.pdf
    • http://waltonjohnsonfamily.com/clients/870437/File/bodowotogudadukaxuboromij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+outsiders+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 16792 bytes
font_01_sfnt_off0000e639.bin
2223d09c8b957338ea83f3cd4c2d5ffcaf8241eead91069544171c678641261e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 20272 bytes
font_02_sfnt_off00011a15.bin
c9b8446070a574f38b917f5266b50ce6c809c40c9e64aef9008c9a2977897461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 10348 bytes

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