Malicious PDF — malware analysis report

Static analysis result for SHA-256 6debfc16f97597d7…

MALICIOUS

PDF

68.0 KB Created: 2021-09-17 11:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e74b22c98e7c760ff6cc69cf9b3dcc30 SHA-1: 65c0ee3e3f15b3117c9c1af50e10a2527938b4ae SHA-256: 6debfc16f97597d714e18cf768f5d5d9c4fcd417ed03113269a134e7555c4285
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8303

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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 http://blossomtour.net/FileData/ckfinder/files/20210910_F547C8726463AA17.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210901_793022286B1705ED.pdf
    • https://nurdagihaber.com/resimler/files/24271606466.pdf
    • http://phutungotodungha.com/img/files/17350541528.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d42a33430---31541159952.pdf
    • http://studiodispirito.it/userfiles/file/51757127926.pdf
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/faxizufawesevuzoripepa.pdf
    • http://gemwishrs.com/ckfinder/stones/files/62351776227.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eff8de515b---25981878392.pdf
    • http://murito.fr/ckfinder/userfiles/files/pobavofegesulukixemewu.pdf
    • https://vibingvibes.com/userfiles/files/ravuvubuduwawam.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/nobonivewoxex.pdf
    • http://sinosteelcode.com/filespath/files/20210904100811.pdf
    • http://shimamura-mail-order.com/userfiles/file/4918814320.pdf
    • https://mlmrockstars.com/ckfinder/userfiles/files/wisinajateruda.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/oaf9jr75d8m345ensfa8phi2lm/webukavazivob.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/4368302407.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/jonunidajexozi.pdf
    • http://aasghsflqsae.handylover.com/upload/files/81323613387.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143321bda521---32796882154.pdf
    • http://discus-rus.ru/upl/file/pifepanaxuzojuseri.pdf
    • https://laznia-radom.pl/userfiles/file/nojigifovomufudo.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142054cc5d6a---lofubuvatajo.pdf
    • http://poslovniimenik.net/firme_data/files/8203173074.pdf
    • https://huaku3c.tw/uploads/files/202109020151293127.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tap+titans+2+mod
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d804.bin
02ded7dca74bce2ed56cab1e6a86053834215879790bd87f088005aa983062db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 17484 bytes

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