Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbe8f21dd104846…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 10:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff94337898e7a51f4173f74057165abb SHA-1: 10a9e9914c3984af85220436291b267720e3efc8 SHA-256: fdbe8f21dd1048466d6be63116118f439459b523c60081bcbe08e60997ecb57b
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing attack. The 'SE_CLICKFIX' heuristic indicates it instructs users to press Win+R or paste a command, a common tactic to bypass macro restrictions and execute arbitrary commands. The numerous embedded URLs, many hosted on compromised WordPress sites or disposable domains, suggest an attempt to redirect the user to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://ketchas.ru/uplcv?utm_term=windows+8.1+build+9600 PDF link annotation
    • http://oticonshop.com/ckfinder/userfiles/files/84292042626.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/4080892499.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/75993850571.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613205af00b95---munumozupo.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/mupavexoso.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147bab9a8311---6921601001.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/9058636367.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/lemovonozasojim.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/22286471152.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8f0b215a2f301fc987b39899f536942c/tudozi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/be0af84b10bcd3933d620178bd557158/boxirolaximivuvo.pdfIn PDF document text
    • http://dalaichau.com/files/vilowifulugeno.pdfIn PDF document text
    • https://fond.ru/userfiles/file/17186269074.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/46692808797.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/gematil.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/45811219052.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/nukifopawufined.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/17404747087.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/jevudos.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/ropovovenanol.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/42472284450.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/71255020677.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/bafadugusujomeloko.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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 10852 bytes
SHA-256: 4b419e9d274d53373f44fb839e4c81469ce78b61e19fdd8e23d00c6b2c72ee14
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 18400 bytes
SHA-256: dff6eecfb7b1b5f2f7554d2608f1066f018e2a6e60c6570e658ebf008fa037dc
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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