Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0e2b8d730ab0fd…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 14:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af174d0e7a83a1adcb60c5433ad329b2 SHA-1: 188edeb51ae7339d6fb5ce5e2ee0a7b34e3e297a SHA-256: 9b0e2b8d730ab0fdaae432ecf62300059f8dfdacf924aea48346fdfbc877cae6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites, some hosted on disposable domains. The embedded URLs and the PDF's structure suggest an attempt to disguise malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://woods-china.cn/ci2/userfiles/files/20210721182553.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd35c530f9---badilirifewow.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622238157.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160989c7746544---80744307995.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c42bfa2e580e1508fef89be79a4ac066/mogenami.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/pelevonaridibezumanije.pdfIn PDF document text
    • https://krossi.ru/images/content/files/saxemofufivikimas.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/17125632149.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081b45e66edc---27235075669.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/21844515086.pdfIn PDF document text
    • https://fultoys.com/userfiles/tobatokuzamurezukitem.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf04f7d9b5a---nirofuzivuxututavibimux.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/919dee054d86737baac6b2973f6a8382/41683277393.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/kkt6r45i11rib3l53n45d25ksj/3096005839.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/sowemaligemifuw.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0b9mtv0go2c4em6ba0nja2p62q/50700060204.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/61183da0b8f34014d4ed69a9ce1f8dac/93407169060.pdfIn PDF document text
    • https://miet.hu/kepek/34689227756.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210614021651.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864abd561ac---38734787457.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc7881f9cb---29346880106.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7e4c3940072dd2059ddefffde486ae19/fowipurukewojomipow.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/rozekofovebigofe.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/69718468530.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/subumokikidofitiri.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/55546992098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=malicious+software+book+pdfPDF 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_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 21108 bytes
SHA-256: 7865c916b6ab19336687d54217cb2c6ce8dbb219b9e39f77942fda0ea901336a
font_01_sfnt_off000132cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 10920 bytes
SHA-256: 56858217f487488ea8381b1cb9e55aafb41bedbc7551ade480a9cb62ef9a42b2
font_02_sfnt_off00014c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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