Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e73a7b2c624a81…

MALICIOUS

PDF

89.7 KB Created: 2021-09-22 11:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43a7aeb93903336eb74b0f678da9e79d SHA-1: a7bf243e82390387297b48f175a541574083afd1 SHA-256: 66e73a7b2c624a81fb71b6735eca88ced2b7f19c6be3cc057fe952a6671d9243
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://crysiq.ru/uplcv?utm_term=webview+app+in+android+studio PDF link annotation
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ljo539h98pbhdd8gc9c92gsgu6/82289668825.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/fizoperagesule.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad13eaaa5d---satuvanura.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133f489c3828---zakonorurasiginatomitifo.pdfIn PDF document text
    • http://ubest.ru/images/file/diwutibopakisozexatewivov.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/71495440215.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/38155536075.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/9734784725.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/23101502028.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/98511002147.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/46362333193.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/87515619174.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/tilesab.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161482bdb5e126---59997575574.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908162326.pdfIn PDF document text
    • https://bselink.com/userfiles/file/tevelimolixameberesi.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/benatefoxila.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/51247553846.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/sijejorakubovafupujax.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/kebiridusos.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/51636058155.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/83215479737.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wojewema.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133320f41dcb---95807862452.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pe1q1ebb6sdhq6kc3tb77f8mo0/forokebozebipafedojanu.pdfIn PDF document text
    • http://videlec.be/ressource/file/gasorom.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_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 10724 bytes
SHA-256: eac5221e58d7c60ecc6dff384f885747f2af6025eafa9141ee7122eef709758d
font_01_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 17888 bytes
SHA-256: c308280089017ccffeb12e40972ad9b7d43f1f15737311391715b22c2037736b

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