Malicious PDF — malware analysis report

Static analysis result for SHA-256 0493408ab1679daa…

MALICIOUS

PDF

88.1 KB Created: 2021-08-06 06:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93837260190811d94e1141cad663ac5c SHA-1: 6d2fc60c6c5f98bc5a1e50f1c9419503d9cfe888 SHA-256: 0493408ab1679daa613d029d28c800a851f4540ad2f348f672b6078731c4c6cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/per6l0g2bkmtctq6u51fjbc3ri/vuwuf.pdf In PDF document text
    • https://hostessima.pl/userfiles/file/jibazilobelopibevafi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb75a2b22c---18132229494.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/diwefi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/laqc78ijr56ss20hg94en6vb27/lotebovizamuwaropexox.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/mevineguxadogenupigeb.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926b89b696e---dobizudizu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b4857e69ab9---kukavujisifetaki.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/mojuzawodar.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061804235973499.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/45010840401.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/52400590559.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/7675834180.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c80bef1e---47195781978.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/89843864816.pdfIn PDF document text
    • http://chieucoingason.vn/files/2921219512.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cae7d0c116---35547432099.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/51674576095.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sinijojiweja.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/82111254639.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/11804501800.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/79513335386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=imagenomic+portraiture+2.3.4+build+2340PDF 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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 23040 bytes
SHA-256: d9b0d00b6f7456f1e03ad2339c713f4aee35459f6f45ddb04f970252369ee379
font_01_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 11436 bytes
SHA-256: 2d79f9c0f36f9e98ffda1f99f0be75993c35476c3aa00f10fc67600a6c21d857
font_02_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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