Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b321416c421809…

MALICIOUS

PDF

78.6 KB Created: 2021-09-23 08:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57d7781897da647f3e1d99cd63ea5ac0 SHA-1: dab05ba75416ae80acae6a31efaf2a26b9bd458e SHA-256: c4b321416c421809895f80cb8e95a9823825caad0f429f41856f89db0086be6b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=free+robux+codes+list+2021
    • http://creationart.hu/files/file/60399109934.pdf
    • http://gowowdeli.com/uploads/files/ralizefexiwozobesunufi.pdf
    • http://we-women.de/default/files/uploads/file/94139544829.pdf
    • https://nycsmindia.org/ckfinder/userfiles/files/13067905026.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147e7f3a43b6---resuvufudijoza.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf09d223a1---87420212075.pdf
    • http://drapa-technika.cz/UserFiles/File/52076429133.pdf
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/8095780681.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/kawelaruduzanivapuwubew.pdf
    • https://jagamimpi.com/contents/files/ferivowigufaputekonojas.pdf
    • http://upakuika.com/img/file/55795110749.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/dff11b3c35a1f2d4224ae24f28e1b637/tonitexilel.pdf
    • http://nusratali.com/userfiles/files/roremugejofotoko.pdf
    • http://klwas.org/userfiles/images/file/47013291809.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7f99f5d6---38568231570.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/69570484178.pdf
    • http://julianina.de/upload/file/jumevitepavudunifetifipu.pdf
    • https://restaurant-kamkok.fr/img/Data/file/vivivuzeruvu.pdf
    • http://iuoooo.com/filespath/files/20210909020756.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/jawanavedigexuxi.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/limasekix.pdf
    • https://kamhosting.nl/ckfinder/userfiles/files/buzivivakebijug.pdf
    • 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_off0000cf3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 16792 bytes
font_01_sfnt_off0000e74c.bin
13507417546cf62a5529f235b20adb47158a2b4f4418cdb1da05674595f38c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 17556 bytes
font_02_sfnt_off00011474.bin
1b3be61c6e7e149c03d2a031d8e29138fb85882a4e0170fc992e351ed8c4382c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 10712 bytes

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