Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d4f29788177c33…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 03:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72da72c2d706feb2d74e90b5f7d980dc SHA-1: 2aadeb612b1886b1d67d055f0dd5b64d0a4ce3dd SHA-256: d3d4f29788177c33f489fa8d8beb89ec158c343c22d4416163972ef208eec641
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, 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 phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/50c6e3119617760a528db7bda3df3661/nigonunaxakamegakisuragi.pdf In PDF document text
    • http://recviem.ru/img/upload/pagupefifelodobin.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/jebimumepijenodi.pdfIn PDF document text
    • https://noventa.cz/media/files/file/46421622323.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/nozatejiburepom.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/winizutidetumove.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/fakuwoxiwowogubesobubu.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/37831538374.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/67723427551.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/79811614883.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/7855972253.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/64783704310.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbbac011f---doxexarukemibogawutuw.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/biguwepuguvuwimugakiw.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/70960421780.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5pvs8e6ehul0hadeu2ouckac7b/14199883836.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/642723d8339424d9e7a34370fd2612c1/tujibinilako.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/11424857009.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/65885022808.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/depusigobudobotokewukudo.pdfIn PDF document text
    • http://emeat.ru/var/files/godemukifutevamumav.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/turipinodotog.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/pijinafigobarukutuvemopi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134d7ddb5574---kiliraru.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320c35e8a4f---39341088485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=schitt%27s+creek+watch+onlinePDF 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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 10612 bytes
SHA-256: e505b375c61dc0ed46702bcba952b247bc517a30dd52b6cbe0cd20f2ff76a5cb
font_01_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 18772 bytes
SHA-256: 3b86202eeeb9e0e616cf1ffe0ed4fb52c927ccfdaf8cafe21b21601e47edca35
font_02_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1