Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef299091c798dcd…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 04:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b431ff8b7c2ae672467c30f8c804b356 SHA-1: a6f14452b332abda3f57a4191b577dae83064ffa SHA-256: 6ef299091c798dcd49ac2bf87af9eafa43e829f9b69b4a7d1566a073c687cb0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links likely serve as lures to phishing sites or to download further malicious payloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=microsoft+visio+professional+2016+product+key+free PDF link annotation
    • https://whitesal.com/data/images/file/7809_20210928141641.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133155fc3274---nazibe.pdfIn PDF document text
    • http://0286869143.com/editor_images/files/bediwigixatorivod.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/90357533093.pdfIn PDF document text
    • http://sayarbobinaj.com/file/lirupuzijexolojabi.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/80584106340.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202109250137155778.pdfIn PDF document text
    • http://devveb.net/userfiles/file/43689209555.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/9506403606.pdfIn PDF document text
    • https://olterus.com/contents/files/17862743.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/laxad.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/vogosidazasiserow.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4b859be3e---81248492683.pdfIn PDF document text
    • https://penal-garazh.ru/files/77894769329.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cb6a5d23493cc2543096a75495d8ad64/pemalavokuv.pdfIn PDF document text
    • https://ibextrail.com/editor-images/22650208152.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/xevawukonemezumozas.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/kezotizakavavomipisu.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vomatim.pdfIn PDF document text
    • http://kleiberit.ru/files/file/tofawokalusom.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_off0000ad4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4C 11440 bytes
SHA-256: d63a501e5b1d8df08ccfebdc459a17ddba4da48a4d6bd2d74994e83193df99b1
font_01_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 14936 bytes
SHA-256: 664d7eb7a25e548ac3ae3bf21610a6cbb8d092f12badf972301fbd39943a6300