Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d5d63a92f9693a…

MALICIOUS

PDF

71.9 KB Created: 2021-10-03 10:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11a805491717569984b177160589e9bb SHA-1: bda9469486ac18829248424f3855745ce4700150 SHA-256: 94d5d63a92f9693ae1855f2d948ec9c750b6123ed7b6bc26928240ccb09d54e9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. Multiple external URIs are present, including links to compromised CMS uploads and potentially malicious domains. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://allytemp.ru/uplcv?utm_term=heat+change+in+chemical+reaction PDF link annotation
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/30192323895.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614099d151bc5---topona.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/35974087388.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/67024521476.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/sibeta.pdfIn PDF document text
    • https://egf.tw/test2/images/file/mimagiw.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16152f92b81f08---66225817882.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/wilawigoza.pdfIn PDF document text
    • http://quetthe.com/upload/files/karotavuw.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/kuwakagabebikazes.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/31314024042.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/defonowo.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/23387016153.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/tovopokuziro.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/59088682641.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/96926594314.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/zovakatawurenutimi.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/71677242766.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109292007053436.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/voweziku.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/fugajilukobebi.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/xolilewobomu.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/1023509185.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/rowirisutilowepitupo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e89068a285---7916936113.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/dadokisizunotikobiduze.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/nugute.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_off0000b738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 16452 bytes
SHA-256: 2de786b70489ccaa451bcba19f05c7e62cfb94bce00c99d0afac8812941b204e
font_02_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 10500 bytes
SHA-256: 396d1d05d39608b7ee6d278bdb6a7236e1cec6ff18d893a2348943e899affbb5

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