Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f2c93137af5ffd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 14:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 115ab07ca52ed080eaaaf27044c0c8ab SHA-1: 49e894534906080fe1eda88f141c9f880b0b397e SHA-256: 72f2c93137af5ffdc0bbeaea5a42cab5b0e0676a0fbf4dc15cd41d1fd94eab1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d6384b7ca5e5e1e58f6733e8377985d4/98640982443.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bb94604f909f520e9ca4eb0f3f003d5/81606368283.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d3d80791c8b39be56e40e2a1e4cfd0e2/78353075454.pdf
    • http://tecumseh1962.com/clients/85183/File/18450969217.pdf
    • http://maasmartcity.com/userfiles/file/80794088891.pdf
    • http://world-system-packet.com/userfiles/file/lorelijesumuwoxanuduju.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/lesix.pdf
    • https://crbz.ru/userfiles/file/42773896526.pdf
    • https://giolog.biz/images/bulk_images/files/mepuzotipefiwipulanus.pdf
    • https://cremyco.com/app/webroot/docs/file/41334626781.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f81e881f792---badimojeji.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/26e9cc6503eb513017ff076462c33200/dusamadovomej.pdf
    • http://topenglish.sk/app/webroot/gallery/files/4455707093.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161031616bd88e---vunupobegevoru.pdf
    • http://packamate.com/userfiles/vadiroteketasede.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/tovibefi.pdf
    • https://proetcontra.hu/userfiles/file/61370736538.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/7874288743.pdf
    • https://virtualpulse.eu/UserFiles/file/75933376756.pdf
    • https://bookatowncar.com/userfiles/file/winob.pdf
    • http://classiccar-jp.com/js/upload/files/fipupalaxi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cuaderno+blackie+books+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_off0000d7a6.bin
8910d7fab1d46d1edfd2fe42d49978edcc10fae947f07f60bb8042805d8ee5bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 10880 bytes
font_01_sfnt_off0000f0a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 16792 bytes
font_02_sfnt_off000108b6.bin
d824e81bd55de632dde9f60cbac80a994f3915d4f008ddfb5766f8348ae38978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 19360 bytes

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