Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b6aed9b8c09b11…

MALICIOUS

PDF

69.9 KB Created: 2021-09-08 00:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 338399aeae54cf4de80e4d27e7bae735 SHA-1: 78f8e7a6abde05a571032c8e32628776ab2ff810 SHA-256: 08b6aed9b8c09b115bf94c0cb6b42c21d379981c48241c31a99e331cd39267e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0880b8b89---57446310499.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68860cfdc4---41753306596.pdfIn PDF document text
    • https://thietbigas.net/media/files/48071541918.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/sabiwukovupagaj.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cc4e2e61---fesadologo.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1623598177.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/lenenatutovel.pdfIn PDF document text
    • http://htcable.cn/d/files/23772861530.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/le61q95l8obm8f1mqshvtkgnjj/ratis.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2k8upklq6ralbs3j6e3cetd908/47902181664.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/78983342512.pdfIn PDF document text
    • http://rayer.cn/d/files/zuwonapevilo.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/kiruvubajuxig.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/limorewimukuri.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/buwilijozogelukij.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/37066871526.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/pafijikukidulaxowas.pdfIn PDF document text
    • http://kasargod.net/uploads/file/jijujafefefojejatufuwo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/52e5c5761aa5148667f285e5dd1afc46/82644123455.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/79280180218.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/senopulotixewevutu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f3e2f13b6---jatuvegigoritekaxaruboxis.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/jowifivalixufinar.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec7f47c8f---3919030907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=implementation+of+public+policy+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/zuzuluwonoparanikiwofa.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_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 10820 bytes
SHA-256: 0fb089b2db270167159adae051a94a3546ab931ddcf23b5b8a4d3afc5d13c652
font_01_sfnt_off0000ce08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 14420 bytes
SHA-256: 9b90786f7d73c6cdfadd59dffca9f9c427aa4f19bb3b263d73d1e5a287235be5

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