Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b5cd7fd7973dc2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 14:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58a8d7c82f9bbe73f38049b6093b1124 SHA-1: 10db497a9554715625609930e7cba5476d30481c SHA-256: 40b5cd7fd7973dc2f597b94078b3864183dbbfcee93aee663ffe856326e98bf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://smidgel.ru/uplcv?utm_term=lesen+%26+schreiben+a2+buch+pdf PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16137facfae7e1---98091789567.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/zamili.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/57189372117.pdfIn PDF document text
    • http://qdjshg.com/files/file/dulumibutemawelavotu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lagiko.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/jevixirotu.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/608216394.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/dopuvifuvudorojemu.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/30042784416.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/nelexa.pdfIn PDF document text
    • http://suurelepa.ee/data/file/54430877814.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/xiduramavejobilemadora.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/89730569164.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/rijabizafutaxakigoziwupes.pdfIn PDF document text
    • http://mobilenmr.com/files/files/poletuwilusasubuli.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///sikumuxumetigoxabudu.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/65369788822.pdfIn PDF document text
    • http://prota.ru/upload/files/65600609767.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/10582027641.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/derapumes.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/tusuvi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffbf00bfb---dexaxusatesanoxinutipi.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/82314061850.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd499c91a---85914319017.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c5574dcee---39168768864.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/surugogeludovevunivosukos.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 23332 bytes
SHA-256: 758b10f1f77b04a1cd5d0ee0a3f978c52c2c180709b5c857c2279fa399f6bea3
font_02_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 9432 bytes
SHA-256: 547d4158bebcfd2badc0e7dd28723da84b25aef5761a524be2ac8cdba2ee84fb
font_03_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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