Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a616f442b6758cd…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 18:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7057a77698fe299e4441a740df1b00d2 SHA-1: c3eb4df960844ae964d0fccf993beb2d432c44f4 SHA-256: 9a616f442b6758cdbdcdae97c8d7cd78deec9048ca0361ba78577c319ad2f411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially malicious content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=sacred+woman+queen+afua+pdf+free+download PDF link annotation
    • http://absolutelyneon.com/userfiles/file/bikukujugufixiz.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4998808cd59494aa1c342b0a7bc17982/3090365733.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/90362362777.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/46127804225.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/voxujawupagute.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/xisavazulojamov.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/vifolotubodesam.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/321ab7332cbbb530be5d989d07ed3056/18198346734.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/40176499061.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/bujutupividusev.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b9573ccdb04f3274b1be8b11ec0dec04/bomajixodun.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/sosepezaziduje.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/sokevutewoboxod.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/87695452857.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7c05bbb287fb6210223bf6752c5250a7/66320140031.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/29822650046.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xuboja.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/xonidegunamobomim.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/875e32bc1c3990337743c434211f45b2/73552901560.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/sutifolezolerase.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbe03fa19---90946078609.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8ea65d8152160e93f485e2b15b9c4104/rixuselofowaxuvavaxe.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/20339543120.pdfIn PDF document text
    • http://vejwun.cz/images/vifonuzosefe.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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 18248 bytes
SHA-256: c52e0c9f03ff4d63b217a6829c2e36dd0ba9125ac65b08ae734143398a350c49
font_01_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 10828 bytes
SHA-256: 3cbed3942a227ce2a0cb41c2de9f2576c147577fcc9b0045c18b3ce9683d95e8

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