Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c853b30b7ffd4fb…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 19:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed5f3a3360c08c7acd5c4132ca61637d SHA-1: 5c59c746d2f9198e096155b9ac6e38876b151719 SHA-256: 0c853b30b7ffd4fb47211d3b8784d800deddea97c92dad875f59ce0a07183d8d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics strongly suggest the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=dimension+formula+of+latent+heat PDF link annotation
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5555daa5c---xonaloz.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/np2rfiouoqbmu1fdcogd8jpk8u/fewolemileb.pdfIn PDF document text
    • http://ruresept.ru/files/file/jelagevimulewutipewedibow.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/os012q9v39ogul4h9ejiqkseag/65070617528.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd300f075---mapokedutugak.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/98229080829.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0319682783f13649c86092ac74c23502/jibomewi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f116c83c867fdd7f20019e679d55d755/venidujagaja.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a859be81---70284267379.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xilalijivarafudupud.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/damamojigatakozigukojuzun.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c04991e6f7d---jaweko.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/811095a512a1514e46c45ed501532db3/derevozij.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/2309387996.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaaea5b10---9350287276.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087186a0488a---23709991183.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0498674a---pewiwinupafajerotofigi.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/varadiposaxewa.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gawotaxipija.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cde7f5834f16006b12814900f4c3669f/wijoluj.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab730e5ce8f---zesabomo.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/9fa1231b0f4b0ae8abaa28be1ee5a537/kodalemibedudajasefirij.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_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 10580 bytes
SHA-256: d4114adbe84b710c5e322b9f59985b078f002cd9e35cb2384a221a8123bb1ba6
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 19824 bytes
SHA-256: 80b32eb49df81b0ab79cdef8d222d43cb4501c38e8ed2cec4efbdaecb2fb5342
font_02_sfnt_off0001307e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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