Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1a5d229bca23c6…

MALICIOUS

PDF

111.2 KB Created: 2021-06-27 06:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b44e7cca5091febf862d87c3eabb412 SHA-1: 0eddbdff7cb75985ada909601852cfe060eff874 SHA-256: 4b1a5d229bca23c65cdf4e763310751f56704d9223890be390550d491b58b5c0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to lure users into downloading further malicious content, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60abcba928---fajefoneboje.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3d764f01b5f6963bc5cf7f9c46f86074/gakikareluvonojiponujofel.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca6c451d2---zilubonurijirami.pdf
    • http://szao-spb.ru/images/news/file/65611277706.pdf
    • https://contabil-fiscal.ro/mm/file/wowisusujuvisodesazibikux.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085231f45831---vabir.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a2dfc45b7d0fbe7a54eb27c15842ba26/22266872508.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d935a0d6f9---kepuxoxagazupe.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47357ac90---navefowusowot.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b30edb960---89785628979.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/32up5qdsc84pdj49dp0vgcm0a3/rurexorokosu.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6e2f065f---39453600792.pdf
    • https://nenanhduong.vn/Upload/files/8654754488.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5824c613---wurafulonekozafanurira.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c357134859---9342956229.pdf
    • http://lammensfilip.be/uploads/files/99210310116.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/r8108v4eeavn89milli5kukri6/vixefutowiguj.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0012c600288870fe613c91248f38c38a/sigitu.pdf
    • http://meadescafe.com/userfiles/file/93928945579.pdf
    • http://bensonlandscape.com/editorData/file/80745092083.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/fugivafamogituxatenen.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1fe9adc8cc58c717b75e3b85b0e824d4/44904937100.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cold+air+intake+and+exhaust+hp+gain
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001340d.bin
3d18ddd8f37f65efa8f53e7439bebfedb71f49fb6445eedabee6f063ae76a791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 10996 bytes
font_01_sfnt_off00014d53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D53 16792 bytes
font_02_sfnt_off00016565.bin
2a1bc7b5ebec18a7a54a7830acd5b06c972d51d58672492bb2d1de957844c246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16565 19020 bytes
font_03_sfnt_off00019807.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19807 16140 bytes

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