Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2618b91c853c7b…

MALICIOUS

PDF

96.9 KB Created: 2021-07-03 17:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11e23d00aed3cf760ad43c296747ddcc SHA-1: 23ca730473771ddc830c9e5d2cbbf7e0ed88d900 SHA-256: 8a2618b91c853c7bcd010bd410e78ac6d006482494d526910fbda32540d0dcaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The file contains numerous external URIs and links to compromised WordPress upload directories, suggesting it is part of a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of external links and the ML classifier's output strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://laborke.ru/uplcv?utm_term=covenant+in+tagalog PDF link annotation
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8305e641b185713afbcc89a5a85aac85/givol.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ae51f77003c0039fc1ecb2863f997222/3001726729.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/85676618427.pdfIn PDF document text
    • http://prosquash.by/data/42560358606.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9ed750ab---27236571276.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bca9c295f---47193424290.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/96706405501.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd569b032a5---35023666029.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb11c35a16b---kobudisemabexejuwibe.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/62516796955.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/94vpnno97oe261jrjumgulko8s/xizisapilopevizazulidud.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/1252328f5ae298afcd5ef87c28dabe11/niwuzivelodejezomoporipe.pdfIn PDF document text
    • https://clubon.top/uploads/files/zazapimolikuwonami.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/191f5c24b3e760d646d49983a9799d2b/mitaloduzilezitekamef.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/33056578717.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac9510e3a---kudafapazezusitul.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2e94ab43---perufetoso.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/53f67c9ea1eab678e5e9a73c95742045/72932923081.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772abebcd65---43967902817.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7ft9mg9ed4bjh0d8e3d0legpee/kugesenotixopetikadajuk.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16096c79d81b98---tuderozorokutazeri.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c5d9c72a4caa498de23d98b0f1f25185/34383194197.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/noniluvarafogunevawab.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/purewifu.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_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 10112 bytes
SHA-256: 575b0214be88589c86fdc8eade7109e14cda9e26b4607f01b119810475d34fcb
font_01_sfnt_off0001299c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AE 20432 bytes
SHA-256: 972f9f7570743adf9abe84534a3493044eea9248ac5d1b5ec69b375702b7fd14

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