Malicious PDF — malware analysis report

Static analysis result for SHA-256 052a8b944585bc68…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 13:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9e1ee726b91110841d94726ebacec8f SHA-1: 1a1d178fce5528256629b55043d1893af12d0111 SHA-256: 052a8b944585bc68d61d6a2fc46b26f9eca55ccde7f800e2f98f5633c375633e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL analysis point towards a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mackbeks.com/files/file/61513747.pdf In PDF document text
    • http://vistobrasil.net/uploads/file/90752759034.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/91111654156.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/43416711604.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/xufuw.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f1c542c01---57663457043.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/pogexaroruwivitawi.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/o2uptub3dvbv0pili0h72ennbj/94447441047.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/pb2atrrkjgobn94cqclaftii47/sunezulovibeninudoxisa.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/riduzegedawok.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/tovisusuk.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/4e521f5395c1790445d3b4735c235e0b/jevutuvebufasi.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/dopavepebe.pdfIn PDF document text
    • http://renknh.com/ckupload/files/78093688405.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9631a08b1---jozokog.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/5289200211.pdfIn PDF document text
    • http://usateatop.com/_upload/files/jovojasozebutix.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed55fcf51d---jotevezulivon.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd9485006---82689264077.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d32a2817f2---vikukonojuwevuw.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86843f0289---53384048512.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/duzorag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=harry+potter+and+the+prisoner+of+azkaban+chapter+6+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 17416 bytes
SHA-256: 5e84e628219dcc081e4ea968c5e217551369f8d94c27f75069fbfd39c4bb95a0
font_01_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 11236 bytes
SHA-256: c920a1a9ba3d6e1bdc26dc2e4df6d36f3d8399570cdd087e8158be2b4bd7ba57
font_02_sfnt_off000133c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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