Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22e563e8846ac2f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-23 19:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcbdb2ac70822a35812674deeda9a715 SHA-1: 35b46d1f7a4f9d9c8b35282957ceff0fa7d6f930 SHA-256: a22e563e8846ac2f95e2302fa5f7bd66b60073f83b8147b399ad19c03a54089e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://allytemp.ru/uplcv?utm_term=crud+operations+in+android+studio+using+sqlite+java PDF link annotation
    • http://oxigensupplies.com/shipinc/userfiles/files/senavuxowufafoleze.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161367b5ebbfd8---naveturixumax.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/95889448743.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/e45kbijdg78tdmst425tnj54n6/bubotovokupux.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/mapiwuretumuso.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/madepebemorabususit.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/nawexofubowojogoxe.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/rugiwem.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/pubumetujeso.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/34958432560.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/jivuwedinetefamageg.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/50484108164.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210919030400.pdfIn PDF document text
    • http://skncn.com/u/files/7001800786.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210902_110714.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/51472178924.pdfIn PDF document text
    • https://trainova.com/userfiles/file/65678460958.pdfIn PDF document text
    • https://tadimtursu.com/image/files/77575649972.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/33625481110.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/35158414540.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/86097482853.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4338330241ad8bdfa85d0a24f3237469/63592831064.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/lirujirerusuvifaje.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_off0000c513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 18364 bytes
SHA-256: 52e149f0351d4d75955036a5003f34e8a5ab7d4d14a562e3a56251b38ea1676d
font_02_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 11040 bytes
SHA-256: 9c5633b68344e2f25120cc897103e471f138b477a3006b5c758deb4e73f223fd

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