Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b42dd2d24686a2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 07:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d3b28490557a24791b83b3151cbd300 SHA-1: bef2bae5b75a5f5aef4ce82ae58955134051f517 SHA-256: 09b42dd2d24686a2ae606e990f91792f2fe85ff2fc4e4c077a49199fa5c1587a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=batman+arkham+city+lockdown+android PDF link annotation
    • http://gibisch.com/files/files/19471605327.pdfIn PDF document text
    • http://recrute.fr/files/files/biwoka.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7efc33ad---41939776949.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/39675878861.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/32833222956.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342ed3f009d---temalaba.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b34086c2773f812ffc4b6877c001d042/32121803646.pdfIn PDF document text
    • https://sinarwaja.com/account/files/sajizujadegepigarefotur.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/67890206797.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/181658865bfda5527769004889515abc/99539369582.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/lexobisevelu.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/fizobumiwijexobetawir.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/37811407147.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/62250799490.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/3595090650.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/tegogid.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/87542409813.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/78627549506.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/xeviduseguximuvafon.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/vuzagigifofuzapo.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/36148306780.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/49137936469.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///15589974019.pdfIn PDF document text
    • https://artenika.pl/fck/file/kirusixirereb.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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 21076 bytes
SHA-256: ab34ce0c3d8375a2c03a54c23fa5b6a73979cc64a8c031861dee6fbea498a633
font_01_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 10680 bytes
SHA-256: f4d5bdfd80ef1e90aaa399888ae1aa866898cc02623aa0ee50ac1ba8201fdac7
font_02_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1