Malicious PDF — malware analysis report

Static analysis result for SHA-256 8106d14e82f1f109…

MALICIOUS

PDF

84.9 KB Created: 2021-07-04 06:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ee34ad056e6193ce38d9a73e89a3e553 SHA-1: 0a168d3f6421d8d33a140b43f17cb419cd4c390b SHA-256: 8106d14e82f1f109402963a2151933ed67cf721061af621620af3f9bd2290fc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or manipulate search engine results. The presence of external URIs and a link farm structure points towards a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 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://scales-center.com/shop/fck_file/file/doxugigobu.pdf In PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/6a75a44b307e4028b51c960fd26b6285/dugosadipaxumozupi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd4ba782c3---boxalalezaziripawule.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a473d0ab4ab---liruwoj.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855d1b0d47a---pelukizojolapugikabovezok.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f678b8a374---tijil.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/25915853097.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1ba5d6af---bapapafija.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5242c579---52103071678.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf6a189c8---moluxana.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/subomatimadinotojabik.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/45739945662.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/toneniduzofupotoviruzex.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/1129593558.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aebce6cfa20---darerogev.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c99548ca9ec---96885631840.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/56224186508.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/57496765319.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/xabupuwazife.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be598bb402e---doredunumoxaz.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jonefep.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8056d548d---pevobuvobokonu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608869b2a7289---tuxomokidovaxafizavupo.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/51952520306.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792a3ee641a---43520269824.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/80d13d4a6d730e1760443b649c79c7aa/11370685300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=male+gay+freePDF 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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 9916 bytes
SHA-256: c814a6cb7af30c2ffc50c7c4a81bf044ff6aa755b56a7de2f9d1f39ae6ecaf19
font_02_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 16724 bytes
SHA-256: 31f71ffd09ac2abbcac4d5914562faa51a923b6d7900b0b1b2577e9c9b68d395