Malicious PDF — malware analysis report

Static analysis result for SHA-256 808fd321eba0a4ef…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 07:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00d4353dd403f8ee5255f3f317be9e6c SHA-1: 8e96e26958a9bb872eb8c0c386be94700c1f69f3 SHA-256: 808fd321eba0a4efedad3705d437e10af79d398395f960ac1e9f76adbf582032
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as https://cructi.ru/uplcv?utm_term=lire+orgueil+et+pr%C3%A9jug%C3%A9s+pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=lire+orgueil+et+pr%C3%A9jug%C3%A9s+pdf PDF link annotation
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/31df73a79b6c87a9cefc0af3cfa4f142/xakisafu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/17804870678.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/wobudalebije.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d7dd3a18cbfb0313f540727793de30f2/dikejimusad.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/wokufuwalaxegudesopo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/30572576744.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-14/20210514201445562042.pdfIn PDF document text
    • https://spacio.hk/attachment/file/86364293811.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c895a06fda2---kezamosidivozotiv.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76cf03de91---vubigufamopuxex.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a751bc9efd8---75720061240.pdfIn PDF document text
    • http://absigorta.come/file/xigubifidam.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q15vj6krberj76t3h82lceo1k0/7684608547.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/134202052.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/db10e9fa6fe5338faf1a30ae674f0a0d/nemimokatowovunitulam.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/15566121118.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/has5qpl3cjaglprkvqec0673p3/sotem.pdfIn PDF document text
    • http://ge-mak.com/files/62554643429.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/13281079165.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/81504494335.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/9c1696d89bd1438afecbaa503cea130a/53097045003.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25ec89feae---16100696198.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/7et117e0h7cnjirkjclnpi0u6t/mugugubibupixinelegor.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/piriwag.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/892b9395f4fcd08e7b737d6f12f3b97e/gukevurefox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 20220 bytes
SHA-256: fc3b3865724b4ffb0f7c2ad82b4e77804cbf08f91ae72c742087f42a4db278ad
font_01_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001288e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 10748 bytes
SHA-256: 51e3f2b85b3bd01962886c74bb7a33b3c74a02255a8f05e4f4aebdf4583d3c5f

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