Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2d51b07a991967…

MALICIOUS

PDF

68.5 KB Created: 2021-10-02 14:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7d90df00a4856232234e40a6aa7ec2a7 SHA-1: 5795b83b84f5bb42b19e01c3c53c84c105eb9461 SHA-256: 2b2d51b07a991967245270c4908bebeee237195242d5e72abe9394b5d6fdf9a1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are likely used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=maggots+in+nose PDF link annotation
    • http://scantech3d.com/files/62100861009.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/81807419127.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/kisapaz.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903152138725163.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/db3c7ufkl5kfgj17ttebu76ua1/nunekodiwej.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad51a3360a---87597715824.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0656b0b34---xesonatofumu.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/39482660855.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/70227008974.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/jenejorusagotefor.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/sopupodito.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b39acbc710---34957514589.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/64262947235.pdfIn PDF document text
    • http://zerosquareonline.com/file/zumorejorawojokiw.pdfIn PDF document text
    • http://epmachine.ru/d/files/75428148848.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614becf6434d5---17824653834.pdfIn PDF document text
    • https://datenglagi.com/contents/files/70959419479.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/82902251862.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf6477df5---jojipu.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/23552396834.pdfIn PDF document text
    • http://104408017.linker.tw/files/lukenedosamozurepadok.pdfIn PDF document text
    • https://krossi.ru/images/content/files/rapoforuwosofalurudek.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/57082402052.pdfIn PDF document text
    • https://liguecasa.mmsfoot.com/stock/file/gabide.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_off0000afdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 10128 bytes
SHA-256: 906392ed2208c9b5ca2429490ff1dba0407e19503854862b84539cb72d312133
font_02_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 15180 bytes
SHA-256: 855de94790ea4f74f5a5997182583a2fcae09095e913de3d52fb3664259ce4c3

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