Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abf891c25372ad4…

MALICIOUS

PDF

90.5 KB Created: 2021-08-10 01:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c57f3b3494f7bd55f9744b11cff0e9df SHA-1: 026ebbf580a68d9d04ab3317b2ede8250cf161d0 SHA-256: 7abf891c25372ad4f51545d93c321617546424e2a6d128a80b6dd73c9fa40c4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings suggests an attempt to obscure the true destination or leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lncl.org/ckfinder/userfiles/files/80498220290.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4f6fe2f56---3340466496.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c26209816754521f5b4e802086b9eeb5/43065869425.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/xigexabedomopuwebavoli.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/goletuwijowanifit.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210718_CE7551B0FFA09151.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/kubififofotogan.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/bavujijojatopakuwenila.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/745c57e228d8898f0917c41f9e285719/tizur.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c6fb5dc2---23894038100.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca037c1cf---paposebotipifexizoru.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5799b5c89d09534bbfc9a7c2edbd5e65/63411575060.pdfIn PDF document text
    • http://moneymaker-gold.de/files/79073297558.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff134552b2---puvitubasopigan.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/13638182193.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffda6f49836---lemivefokef.pdfIn PDF document text
    • https://tappowine.com/file/61392579120.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/juzikikejotedonitogu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf0412120---balafimovuzidipipamutebut.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ee18a20ab22fbddf43adeeb31595a701/zowexok.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xobawolavipo.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/duneteserijiwofa.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/60627172070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=percy+jackson+and+the+olympians+book+5+read+onlinePDF link annotation
    • 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_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 17012 bytes
SHA-256: 4d7ca21b82a632cb39919ef89c76463abf4bf1b7ca8ae0d0b53cf6297da39840
font_02_sfnt_off00013f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7E 11392 bytes
SHA-256: 4a4469313da73cacca606df16b416c40511082e71f8f6a48c5fffbd3b0f20072