Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d983c323e12d473…

MALICIOUS

PDF

67.7 KB Created: 2021-09-21 16:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e25cb1e0455f8d3b3b7afec4b67bae40 SHA-1: 58ecaa9bfab67934e8eaa226186cae91dc47749b SHA-256: 9d983c323e12d473b4e2932949edb963aed972c47bf6c84f2eb595f6b3091846
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure, such as being image-only with a click-outward action. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of multiple external links and the overall shape of the document strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://crewmak.ru/uplcv?utm_term=five+letter+words+starting+with+ab PDF link annotation
    • https://onderdurdu.com/upload/ckfinder/files/kuvozovaj.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/pozodajawabutuw.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2c6f9cfbfb3973cd09e035d012dacf0f/tuvogolexigejif.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/nokixetalulowo.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/89232042484.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/20393327666.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/gupumavututi.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/43828983279.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/jurinotebikumawonuzefum.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/vetimumita.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/93482640725.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/2921450798.pdfIn PDF document text
    • https://landi-bg.com/images/file/35104041701.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/negolojiw.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/34581204883.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210905094243286466lcazl.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/desenezawa.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/50e4a81d506c36f1cdcd8bf4f7d6c760/kisifajodaxuwetewujezuju.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/88048304423.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135865fe5a44---44946397096.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/werobalixawobug.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/31196033761.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/88487863883.pdfIn PDF document text
    • 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_off0000add2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD2 14212 bytes
SHA-256: 44f4dcc0ede9a4e96431eafa9a20fd16b04445001ac0a05cacdbec8663e28885
font_01_sfnt_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 10796 bytes
SHA-256: 406514d237d0eacb2688050d5a59bf3fbd3ba04d620fba91e885e955bafc33e0
font_02_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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