Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f2df324a18b6b6…

MALICIOUS

PDF

110.9 KB Created: 2021-06-25 20:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 283d3fd9dbcfe0e6864f7f262c5ac56c SHA-1: d7ffe768a8cf75803978f4ba27a1fb42ee4dcb87 SHA-256: c2f2df324a18b6b68b8b68dc6741650ce90cd48aedd6f7c77c577c0b82376796
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites using the Formcraft plugin for file uploads. This suggests the PDF is being used as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://queure.ru/uplcv?utm_term=birthday+gif+for+brother+with+name PDF link annotation
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4526e45a---budufejuloditev.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb7e676cd---puvifoxofosipudi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/koj123tdt70rcnjgntnl2fm7tu/jixibepojagaderamimuv.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4eeb8312d---73188766463.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/48769688816.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763b412bebb---daxadixesaxomut.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160730d5b81a2c---37370758576.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/63397169529.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0a1204ee---49725116914.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ad344eef9aeb20463dcd7870720e636a/75391009910.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb13812814b---5620850350.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e507dd84---mikofomewuwaboref.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035339c31d---87670188455.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa282ef737---58308178188.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16095ecaeb830f---duxizaguxese.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8nofme2tdkgdn5fsmnjh3gla74/72688120299.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/aserpp4h17v79a1p190tg58dbg/lijobifuli.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/02671d002213c92a887e2aa9a03df276/xinujipabobipok.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac16cdb68---xowobilabuwulaze.pdfIn PDF document text
    • https://papiratisk.cz/soubory/bipilo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7h25dvper8vf6hu9kffm34ghbp/98625173351.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qaem543e51vfe9oekols65effo/13952811319.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/21113822923.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/34167667796.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001383d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001504e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504E 16400 bytes
SHA-256: 223a89d6a57270a564c69995d9690b81a693dc9ea0d97eeb7ac865211bbaceba
font_02_sfnt_off000166a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A7 10980 bytes
SHA-256: 649a849eb951c67e408513d0940002eea4e263ee1dac38e2746ca5a12659b7b6
font_03_sfnt_off00017fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD1 17688 bytes
SHA-256: b4730719b538599483154ef426af94e06bdff74f2c0eb56f35d8828087b8c720

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