Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad28b721a0648c29…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 01:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82a112a04668331c18fe3376137699c7 SHA-1: 257e49155140b2155ac2b02dfa59bef323b32104 SHA-256: ad28b721a0648c292739c82a290a8743da4866535ee3de77a85c3033955f896b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URLs were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://huntic.ru/uplcv?utm_term=battery+capacity+for+laptop PDF link annotation
    • http://naphotelbangkok.com/userfiles/files/kagebejojason.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16123447fc632f---60235098382.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/20783035163.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/zagutisevuvimikulo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/616d6cfbb9756cae06f14359a1ad762b/83769855003.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160977e3fc84b2---50286493463.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/61137885940.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e880de5cbae---ruledub.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5a62657c3a828f1a46aa3fd73df4aa4b/83043155829.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ec213b82f---88131903398.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/91800336954.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/885hbp6q6kbe029hboneljti7t/60492673229.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/62787359003.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/7jb6vlt6noblr7npd048r403kv/voxerebe.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/82841225406.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wotamidibetenavu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/51f0d165bd965b20f8f03aaa5ed7c96b/53152944660.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/85481623693.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210802/file/16278777334523.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609078d6ecd35---87850265166.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/potor.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611d097a96d18---xatibimozanaxigiwabo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/10915429764.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60a957a2b---jedoviwakowebiji.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/783ef6e7dbdda36efa7bcbc2159301b3/mevexumo.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_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 10368 bytes
SHA-256: 68eacc4cfd0f97bcbafb911d56fed34183fedbc0a7886824e80a66ced22cd179
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16856 bytes
SHA-256: 501cab6b263e0728da8b0d18bce4099f4b80ff2c973923715ae8115cc335db67
font_02_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1