Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78364a02a074688…

MALICIOUS

PDF

92.8 KB Created: 2021-09-18 07:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 66acd3347aef05d8bce06f9ec1d2b9a8 SHA-1: c988ae8b57be59cc2f23e807fefc7aa4874c67ee SHA-256: c78364a02a07468835b3f1ad54a80802fc99eac73d4a5804c39719adfd0c19ad
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms on potentially compromised WordPress sites. The presence of a visual download button lure, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/28863839184.pdf In PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/76199062036.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/naxokazakalasezenofubof.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/rutedamuvezebezixelalidax.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210914_014642.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/56611377919.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614503eadd3c7---47129235458.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/mujefosakasimaparan.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/raralaxifomurirezubof.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6fd6663e97a5076cea9597b3f6747206/9551792886.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/51980295397.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/95559881257.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/wavaxawejilevatajuvi.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/mubutapuxarilefamaf.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/kkeu0ahio0viueou3eqjfal012/xobojutevujiniwadixewo.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/86518085349.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/jaxivazizedolozaxevun.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/31112651304.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/35795173046.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210913095125.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/14047709877.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d8822960005addc0631e9cdf9bf474ed/nizisojitusunatepub.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/78029052920.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95213953064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=headshot+tool+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10276 bytes
SHA-256: 23e6e1166fa7cffd7f85bdb28427115ae90a2da4c6f0450d81f2a6d90f2ea95e
font_01_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 23376 bytes
SHA-256: ad229ff3cea082c2f7e715ad8b82daa69bb946001d1da23977fd895b28429615
font_04_sfnt_off00014df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF8 16380 bytes
SHA-256: e62cca045312918b292d130d6dbdb9eee357ae8462ef5226f02e869bf229e283

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