Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa6e58f782cf6de…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 21:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c41df4c79ef2ef75d697227bcf9107d SHA-1: 4663c8967c343360929d3eb644bb9e1f02f107df SHA-256: 8fa6e58f782cf6ded07fabb8836e10253cc3d1b2a35388d7d235cf2878c8b2eb
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No specific family could be identified, but the techniques used are consistent with a malicious document dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jr-bang.com/uploadfiles/20210902015230.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e6127b54b017e211d26827d2ab3aec97/mafek.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4a976b6fa---gokafinenopeforenuf.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/vomagapaduzidegaxesujujen.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/14614886768.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nutibijiwerilebojozut.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/14352284400.pdfIn PDF document text
    • http://storemisr.com/uploads/files/9991520603.pdfIn PDF document text
    • http://uteambio.com/upload/files/rizirovokevedimalolo.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/51064471960.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161498dc72981c---zagemawazowexo.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/99511301379.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/filololibibukogetuzanati.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/mekawi.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/femonitiva.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7a306670---87736649012.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/giposetudadegagogumu.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/suliwutokepotidoxeto.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/wigekuliku.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/gegenedizew.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/99061950655.pdfIn PDF document text
    • https://casaalu.com/luutru/files/29387155801.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7ca95d73---wegevejigaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+game+ratingsPDF 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_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 10528 bytes
SHA-256: aca0f6a1ec26b6711eef32b81e1e9e1be6fe89025f595d6031e54abe89064212
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 17312 bytes
SHA-256: 309f77092ae038e39446bef82475845d1e388d2ee771a0f42cfd4e170c71056b
font_02_sfnt_off0001334a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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