Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8c5880e3841300…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 22:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9ffbe2881fd85429f27043e5d7d766f2 SHA-1: 1b81391389551138dbdb52003d4f9481909d4c9c SHA-256: da8c5880e38413004782d99f644ebc622cb32e85b6e4fb9f76048674d3c81628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://anthonygillant.com/userfiles/file/37181238309.pdf In PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xowebanejiriwenijowi.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekarukonafejip.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/61224871101.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/posififasekaxivogevubenud.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/tumumixijo.pdfIn PDF document text
    • http://elitvorota.ru/f/file/lomegunekaxejoxawep.pdfIn PDF document text
    • https://tigaintan.com/contents/files/2204976917.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/zawub.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac4556281---17785035297.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/rikajonisepeviziki.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/domizejifapitagelodi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161446ab17fa22---78546637679.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/83204900735.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/88923736830.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/59403281201.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/25941465292.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/mugesimi.pdfIn PDF document text
    • https://melz-feu.ru/upload/94437839236.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/telizavulezixepuvaliwap.pdfIn PDF document text
    • https://designclarf.it/file/21101659769.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/75224671155.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/29pml2ect0h2ctn1jp4fasri23/77827138347.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://rais.bg/uploads/file/38333525973.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/gudotatugasikofarawaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=venom+carnage+full+moviePDF 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_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 10548 bytes
SHA-256: 2aa5e9cc955f81237be24febba886e820fada27cc92f565b4358883e83929b4a
font_02_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 14764 bytes
SHA-256: c912c6cda8086dcfe2876b4e37665d058d67d35eb93196a5c973bfb96910ff0e