Malicious PDF — malware analysis report

Static analysis result for SHA-256 1959159d78125587…

MALICIOUS

PDF

88.8 KB Created: 2021-08-09 14:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c321db178906cf78fa9a60d6245cc24e SHA-1: ee07cc892d4077d45ba9518909d5e707216725cf SHA-256: 1959159d7812558775e0bd747b7bde4ad7c50c2912c79a5e678b90597163af41
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to direct users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://esipro.fr/userfiles/file/92539637550.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/530eabb005e7d069776244e7d574aba6/48657398665.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/q0qgiom330df6fkli80i3gri8h/banuponawariwu.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/zaleg.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805223f03a4---dimetibalorufuzodeki.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/megup.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/rovawunetigetokoju.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be777bf1d52---ruzonogegonuponudop.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/94926671036.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/28613482705.pdfIn PDF document text
    • https://migger.dk/userimages/file/jozofakeredofefowakoretot.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbfe1dcd3e---sukiketajavag.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/185e228b430c99d7fee3e9cc8da721db/85284867298.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fcb1b6ce3---mosukedunulujabev.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ut0kalesgdgrp3dv517itp1tb3/92115062217.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bf19efd8---fikagesosularofinebu.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/45958501507.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/31216344814.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dd99ee0007797fced029ebbcc1ac03ea/40782484687.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e12cc64496ce68fe8ea79e1891e385ae/dazumap.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/88640417020.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd2c9d51c---sajoloxafozupotef.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/sufagudunonukasoxa.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210619225149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stellar+ost+to+pst+converter+9+serial+keyPDF 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_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 21324 bytes
SHA-256: 376d52903ab8b75c07ab35a84da3ceb454bdd1795e05945746ee021268ceed82
font_01_sfnt_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA1 10884 bytes
SHA-256: 1fe414c692627220ea452e60409797f0dc1ddad14a848531c69f658bcb5fce91