Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b1267e3ed77b43…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 11:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98cfcb0e6cbb288ad16bce48114bd325 SHA-1: a03e0badd0ce9eeb9776176f27ca0b7c014afbca SHA-256: 01b1267e3ed77b43a30ad2e8984dcc5f03b894914e60e372f81aef8c95777947
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it's likely used as a lure, possibly for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=aptitude+multiple+choice+questions+and+answers+pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160afa3839bfa2---tojologotavaxevuviver.pdf
    • http://leebyunghun.kr/new/upload/board/files/mewimesiwibozubefi.pdf
    • http://younewstoday.com/task/userimages/file/viwonufuwubemikedun.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8cf11b39ce2a8f9030819ee10879a423/58066949192.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/duwudinupukewilebepeden.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e9221e13d---fekefarav.pdf
    • http://blpest.com/UserFiles/file/68552849619.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rqnmv8fp97aptk3ccq7l8epmb2/95298610060.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bfd3f17b6---jukijorimoxitifelafopafek.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/59c1c288f79efa9d7a19ef806a816811/kekudabobutew.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160acdc9b48e32---22677281861.pdf
    • https://bestcoloringpages.com/userfiles/file/xijebiketazu.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e75197be19043eaf8c8e1cd9f74442d/modoferomodajazibi.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1fec81f98c2513853e29620dca8b4f15/46906905129.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dd2ec16e5---gurixuvev.pdf
    • http://auksozvynas.lt/userfiles/file/11741715132.pdf
    • http://orderleesushi.com/uploads/files/60862739016.pdf
    • https://maxflowfans.com/userfiles/file/10622051244.pdf
    • http://www.findvoters.com/userfiles/file/zowimolim.pdf
    • http://orderbestwings.com/uploads/files/11278552805.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0b0e05e961caafaa0e779eadaf18cb0d/89594453118.pdf
    • http://mooneyes.pl/userfiles/file/bumaxovozomafominaniki.pdf
    • https://agrimal.pl/userfiles/file/83387390999.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a097b8e6f18---10318229346.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_off0000e794.bin
58212d90324dc843f52725df3a2878c2609169555e7f25b558b315184fde9a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 17584 bytes
font_01_sfnt_off00011612.bin
0146e15907b6d4ccd7c5fe9dea9bcfae0ae8c2ddbbc80835ebe7f5e0ce58b7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 11196 bytes
font_02_sfnt_off00012ff5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 16792 bytes