Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4ad15c7d68bb6f…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 23:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10e6b34c599921c2bb6b3017a347b598 SHA-1: b39ad4c0b60cc7605e2afb0056419bf190a4282b SHA-256: 5d4ad15c7d68bb6f5c3a906c70803ff852c12302b07d24ce05d57ce25dca7e53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://duda-tech.pl/dudatech/upload/file/67840642006.pdf
    • https://sanaspinler.com/calisma2/files/uploads/miwiferaminepevume.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be82b87c3a9---13791974616.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e83dab65---82943950656.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6803422b---35540916586.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3kkv5nn9n5dak47hqffl65rv2a/69473505417.pdf
    • http://focostrade.com/files/20210617074229.pdf
    • http://rustproofingottawa.com/userfiles/file/14517173337.pdf
    • http://sl-light.ru/design/img/upload/file/lopozemixejimekosu.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fb12e2d463d03886ec58152585ca7cc8/duvujetalefipiguxitir.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078485deb589---74098646730.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fc0e3e49---13335322142.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/63lqdlobtba9k8fntf3si49msj/54881354899.pdf
    • https://aterhesseg.com/up_image/file/91304470247.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/02a0a2af828616663654fe261ad1d1d7/nodalipo.pdf
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/fivogorakilipedinige.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0db0ab1126f76f439a395d1fcb12efdb/93262178942.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/be3f3e63f3e37c18d7b33f3ee10dbadd/44928478184.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da042d93c6---tuwipivegoliridawokibe.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16096ffc636193---befutijim.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/kewawilojadegenepefasimum.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/j63l2bvsddeifgo6mrknfeddn5/dumupepitatiletub.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4af3722f---kivudon.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/78081242488.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718ad43adb5---tewoguneb.pdf
    • http://ccswcd.com/userfiles/file/68224933875.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pork+chops+with+apples+and+brown+sugar
    • 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_off0000f4ac.bin
18aa9301ddc76fade32974415b580f2cf1a0a6b581141a294c3588a956991aa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 17572 bytes
font_01_sfnt_off0001224b.bin
4983a7dc0f139e8e26247a2a0580aaf8551a54da966251017c3951f1484299fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 11212 bytes
font_02_sfnt_off00013c24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 16792 bytes