Malicious PDF — malware analysis report

Static analysis result for SHA-256 3044c09d2207b8ce…

MALICIOUS

PDF

89.2 KB Created: 2021-07-08 23:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30d158dffb72412b082d740705dd270b SHA-1: e9cc10a9a488ca9ac44ea1507094685fc1b445d3 SHA-256: 3044c09d2207b8ce93dbbdbd0ff390b90cd187387bd464566e68880e48da652b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It impersonates PayPal and contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware or phish for credentials. The presence of embedded URLs and the 'SE_BRAND_CREDENTIAL_PHISH' heuristic strongly support a credential phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://inwebjor.ru/uplcv?utm_term=chemistry+thermodynamics+questions+and+answers+pdf.
  • 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://inwebjor.ru/uplcv?utm_term=chemistry+thermodynamics+questions+and+answers+pdf PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b91c202ee2b---94610175382.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210529221711.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fh3cm1bn9irku7jg3fpfjcvf16/zimesojevezegad.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b0f92c4ca74de41e5c24fe1cc56a38e/56717186233.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/52803100420.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/lilasimakozukojativavo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea0f72649---29028114831.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160943e4d057c5---befirido.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab73e49e6---bogoradobemapopu.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/todunimewuwu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2f130dae9580e44177713735cae46440/fofemolotegapomafoda.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/sinuzipofixogorusenipem.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/cb1luseuqgfvri1j4scnso7guo/rirowafepe.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/gatobizopowi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/noajg8555gteac5a8p2vi73au3/jirefubininagusite.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160788a80a65b6---66819523164.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fa31ed048---21961821390.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077500c02a5a---lerutimu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30422cc05---sedufovebibizi.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/piresuluwofalajugo.pdfIn PDF document text
    • https://strechybenesov.cz/content/lefupogo.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/67522403616.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083077bbe3e0---64426992838.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 18020 bytes
SHA-256: 3035725740444c21381e382de737738fc8f336867fec5081d3d183cc73f33993
font_01_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 11316 bytes
SHA-256: d8692aee2c3f71b99aac4ffe3387e4323e64728d28d4bdb343a28927f7788139
font_02_sfnt_off00013f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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