Malicious PDF — malware analysis report

Static analysis result for SHA-256 6746f9000b1eff00…

MALICIOUS

PDF

77.0 KB Created: 2021-09-30 17:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2cc863326303203855927291ee0bdc71 SHA-1: bf81a18b75383934f842f5a595bcfa0be8da0362 SHA-256: 6746f9000b1eff00b5b6b3838161e56dec02a74d1ab2c62aba5aad7fd764013b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://huntic.ru/uplcv?utm_term=millet+shootout+battlefield+frontline PDF link annotation
    • http://advairtech.eu/assets/userfiles/file/vepalapo.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/rojufevipuwawagepo.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/fapabemiwevabiv.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/kaxagolekavi.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/sepokobuwega.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/fubogujudonixugemud.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/retevobir.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/bexataguxosapixogisu.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/42999819240.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/87507657067.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/xofivenadoje.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c173960565---zopesidokesazav.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/26089959352.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/wovukak.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410bb27f82d---91291814189.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/wupaxonepiwa.pdfIn PDF document text
    • http://3234.us/data/attachment/file/lolivixodeborafasob.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2be7b64ea---19692658070.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/30669623817.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/xololul.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/44861582383.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/32869435161.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 17332 bytes
SHA-256: 1563dc2ec2fa2e563902aa0307b2525b2a85fbeb1f75a4dd981a6fe3f554790a
font_02_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 16892 bytes
SHA-256: bd21ab185c0a4362246058380cb9bac55b8b6d4cda8eab731a3c7dbc90c3da6e
font_03_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 10684 bytes
SHA-256: 7e4fd5e234da2ede3ded085eba18bb398512413eaa115a6db8d0a0f6f5c22c89

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