Malicious PDF — malware analysis report

Static analysis result for SHA-256 d883275eec14cf7f…

MALICIOUS

PDF

87.3 KB Created: 2021-08-16 03:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 182ec37ed5649835157722aef27af086 SHA-1: 4ee77090609faa7e5d1cccccc9dbf3db6a374c31 SHA-256: d883275eec14cf7f76904ce01d81bb73a79a769f4128747ee3336fc6467eb4ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive links, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://benardoutlite.com/admin/fckeditor/fckdata/file/89100914666.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16112542edf919---lulidivojuwaf.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb74056c8---14080829727.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d54b0cffd---38128133530.pdf
    • https://hotnews.md/upload/userfiles/files/96206859471.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af89c18d338---voleforowap.pdf
    • https://olterus.net/contents//files/xukokimowax.pdf
    • http://kibbkw.com/uploads/file/83949174363.pdf
    • http://cl-pub.com/files/files/binafusakos.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/55606856006.pdf
    • https://sukaunited4d.vip/contents//files/28649468996.pdf
    • http://kowalstwwo.pl/public/cms//images/file/jubogebe.pdf
    • http://domeinbeverdonk.be/assets/files/file/86590715200.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc9016904---80437486861.pdf
    • http://nsdadventist.org/FCKData/file/gejavezesukovagagi.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f107a0e77---waludogejerozolipoxu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e21bfcbd37e---kegutuzuwadok.pdf
    • http://sosnovgeo.ru/userfiles/file/75989398613.pdf
    • http://optikametuje.cz/userfiles/file/34235959691.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865e39e2874---tudovorosavuliveso.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/721389eea48c325bd01833663db17c9b/lepovekobuzajolitekawu.pdf
    • http://masan315.net/board/imagefile/file/30062723378.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2ce2b9bfeb440e684f1fe5c4534a1e3c/gidipupud.pdf
    • https://blv.by/upload/editor/files/47296400201.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868263ce854---busilaweve.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=aquatic+biomes+chart+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f050.bin
7c65fe4fadbd8c0a148d51aa9dcb600e021ef7766dec08a856d5357cb06d5722
pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 17072 bytes
font_01_sfnt_off00011cdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 16792 bytes
font_02_sfnt_off000134f6.bin
5b996a2e72673722042aa65c8a13ec352d80cee5d7fb307a5c36443a84ea8154
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 10904 bytes