Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d90435819a96506…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 18:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76724c60586cb5c1b483c002c5b1af4a SHA-1: ef5818994f90b0cb3656792a65e0c812d056b52e SHA-256: 8d90435819a9650610b43b41ad7e27fee826bf7d6153d7595ab11bc54a2611b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and other disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kaztelcom.kz/ckfinder/userfiles/files/25719866687.pdf In PDF document text
    • https://markapin.com/calisma2/files/uploads/46323667058.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/43274611228.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420a1595ca9---48857309934.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/8g4b3t47le9nat70pvrm27vlgo/25997195710.pdfIn PDF document text
    • https://chp-travel.ir/data/file/79915312856.pdfIn PDF document text
    • http://delve-cr.com/uploads/tazegamarugigisegufuji.pdfIn PDF document text
    • http://sinners-party.de/media/file/78875052949.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/gabelebagezedisa.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/zoluvubek.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/laxumewuporagixofed.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/sexudodigopukaj.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1c79143a25462ddda083630458037cf8/54509749614.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/13/mofotatudikid.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/kogilokesaxibifulos.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/68901961570.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/rejasajekaresoda.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/nilofuwibip.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/39558340414.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/dikivowi.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/76745463434.pdfIn PDF document text
    • http://netart.hu/userfiles/file/vemojawenebipexalimejeg.pdfIn PDF document text
    • https://combrooncom.com/contents/files/52805964151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=attack+on+titan+mobile+apkPDF 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_off0000b1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E0 10480 bytes
SHA-256: 57a717e3b0b33d6e05b09bb2ab41d9446775effb19837ca309b03277a5b037ff
font_01_sfnt_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 15908 bytes
SHA-256: 9a20246dbd1a1ffe2383dc76529a5494f9f3f7517809a242caa96c70eb8afb23
font_02_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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