Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43002745c6f1aff…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 21:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39b8ff718ca1fe13e31ae089e3ed3506 SHA-1: bb88f0a2d8725154e35a18b74aae00d02bb032e5 SHA-256: a43002745c6f1affd73d433cdeb9a5d51956b64657b8c381ed626b7922bd2a8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or credential harvesting attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wickedcheesy.com/images/file/kikevufavotukewe.pdf In PDF document text
    • https://kermanrooz.com/img/files/vaxepivo.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/tezanabopugizafun.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/sewopunibeji.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/075abe55bebacdb75e1988bb36e3dda2/warasup.pdfIn PDF document text
    • http://packturf.fr/files/zekerin.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/detisatukakegagexavojov.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210704023242.pdfIn PDF document text
    • http://bluebossa.pl/files/file/kakax.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a5cb75806---kirumusojunatanurenudu.pdfIn PDF document text
    • http://stevis.cz/files/file/3361010696.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bafd9584c---bobufefa.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89f6ed4a8---ziludabebewafikafubax.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/xexamu.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080656951440---botosagowajokawapubanu.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/93525625119.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/62935145471.pdfIn PDF document text
    • http://halmar.info/userfiles/file/46474211837.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/bazewazus.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a42b0460---72253155470.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/613am9uk5iopt8i6s1n41h3dn3/89028281599.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/22020188453.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/netojurofiwuvumula.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/rosetedopalupat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=archeological+dig+sitePDF 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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 10524 bytes
SHA-256: 3b2ee9dd4f63398b6f59a287efba7b454a39ff91b1f7b60ea0f5901addd5cf50
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 17504 bytes
SHA-256: 38cb8a01cf43d5138b4a9829fc643725361f83f8f38de8b839a17eecf52e10c9

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