Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdcd263c5dcb5a4…

MALICIOUS

PDF

69.7 KB Created: 2021-09-09 03:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 968619bd8240eb5f7b53ee0265ca4278 SHA-1: e38e48478d1afcd8d21ffe516f542f03f79143d0 SHA-256: bbdcd263c5dcb5a40c9b7b604e8485ab68217a6a597cb8facb13d786f446230d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The primary attack pattern involves luring users through a malicious document to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://candientushinko.com/images/file/jekituxu.pdf In PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/fafipukipifepibivutenupe.pdfIn PDF document text
    • http://vipdiler.ru/files/file/95483070271.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/18271795850.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/6110078622.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/derinare.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/62997238044.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c84e8d30---pofinozelum.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/pufesalavomujapiwikivoman.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/wizesisubagetovode.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/dolotose.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/90512266878.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/46546092730.pdfIn PDF document text
    • http://abpaluso.com/upload/file/voruzasalujekugilorinogup.pdfIn PDF document text
    • https://12tiga.com/contents/files/19124016669.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/fezoditinezafe.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/71037104418.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130788ea9618.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132908c9ee7e---dubijitexabal.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/51280315479.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/86956621719.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/27148945534.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/1479629450.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/93487325352.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f765713eb0ccdeeea9a3c65cbbf375b0/mamudavirikasosibek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=masterton+phone+bookPDF 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_off0000b422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB422 10436 bytes
SHA-256: 6be77e73cfe532e429588bb430758ad921771f9443beec413f2b965d7803f990
font_01_sfnt_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 14844 bytes
SHA-256: 3500d99479bb468d5343e33a5e594356eca9d306d275bcc54c0febe93ea4214d
font_02_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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