Malicious PDF — malware analysis report

Static analysis result for SHA-256 12678887d9f9fa99…

MALICIOUS

PDF

290.4 KB Created: 2021-09-25 13:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab2c9835716f78814318c389ea9bd656 SHA-1: f2bc7f208a9ff961025f332d652f680f0b654183 SHA-256: 12678887d9f9fa9904b4c45631a0f81fd28c48822c8bf63e40fbdff365fa3c69
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external resources, with one specifically identified as a link farm hosted on a compromised WordPress upload directory. The PDF's structure and heuristic firings suggest it is designed to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8160

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://queure.ru/uplcv?utm_term=minna+no+nihongo+i+2nd+edition+translation+%26+grammar+notes+textbook+pdf PDF link annotation
    • http://madurastones.com/userfiles/file/nuvopewikubizotusod.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/zoronefovagadowegurebokuj.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/dijasugafoja.pdfIn PDF document text
    • https://rais.bg/uploads/file/41121575840.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/82870111137.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/38557477386.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/rusemokusaxew.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/xewanofoxezeka.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/11370742852.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/luresasesosafifo.pdfIn PDF document text
    • http://dgkno.cn/upload/rogukovabosokaw.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zuresupagodugegesoziribiz.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/kikipufen.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/32434326572.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/97120553235.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6f42469cd---31203235160.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/34979020058.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded3a56e13---24573558773.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/59357275894.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/rufaxis.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/67b2359b24d3ba11fef8453fe7f0e1c3/67731368714.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/wogikup.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd6ab0793---giminuk.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/fetokekuzefuxob.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/xowugufuguvozepalit.pdfIn 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_off000336f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x336F9 105712 bytes
SHA-256: 17a4647612a4d9132865e25b3c32fc5a8f7c89118c68bfd7c92b92f30afe7222
font_01_sfnt_off0004445b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4445B 18780 bytes
SHA-256: 8326a31bf67c406f80159c7880a477ed48851445161092e69c542d684da2c466
font_02_sfnt_off00045f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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