Malicious PDF — malware analysis report

Static analysis result for SHA-256 4414ec940273d3db…

MALICIOUS

PDF

91.5 KB Created: 2021-06-27 20:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e014dd080e13f95c4aaecdc15455f229 SHA-1: cf5cbc8f504c5f118322b769e4cad78c8c4c2c51 SHA-256: 4414ec940273d3dbd6efd8347ef5fc152dca8d5f5e4e2432b0a92d35e09565f7
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URIs point to compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic firings strongly indicate malicious intent through link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://catamma.ru/uplcv?utm_term=introduction+about+programming+language
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb567d672---waxodaxu.pdf
    • http://clubselectionvoyages.com/images/file/vubidifubef.pdf
    • http://ahkjt.com/upfile/file/kolazugutidoluramunatot.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/18ffb4532f8b4f2608e46a72013db417/34082851059.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/cb75407cd74f24317e6fbddc5135016f/velojonew.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160933a7f2ccc4---30990517494.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p3pa382ntpb8dfca2snnu9d593/vazoxafedadederag.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/78d55c303b63f70445d846dab10236f2/45749380108.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4596adf0b---nazogawe.pdf
    • http://technoculture.cz/admin/upload/file/56710755453.pdf
    • https://manenshop.com/upload/files/77345569805.pdf
    • https://pjkconstruction.ca/images/file/reseripovabarojemurubetus.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/01b23ee0e1e17c1bdb41ba2ee3b467d3/9358898985.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ae09c767---16540892183.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3381294a34---2579086235.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/nujixajuviluraxaru.pdf
    • http://skonasystems.com/userfiles/file/pugipitivolukavumawebuku.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0b2f3d7dbe3e2ca0bc06c0d10f6e814a/30059941804.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lfeui1gs0nrvmu2bn1phoi53pv/zazuvozaxumawa.pdf
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/mabajugafaxunitidewubobef.pdf
    • https://advance-pack.com/editor_upload/file/lodagapaneribujuzu.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6baee457c---61442780994.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f00adffc---rexonafadogoxevopafal.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a094bd5f41---92971772861.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead7.bin
d72f218cde4115981f7ed2ac3b165908f67c4d057c0ce830b553cab9fb7db023		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 10880 bytes
font_01_sfnt_off0001037d.bin
fc516f134ee508eaeca4f8d8d4df77fc00373b48b0bbbc126e55748aade98d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 17100 bytes
font_02_sfnt_off00012fe9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 16792 bytes
font_03_sfnt_off000147fa.bin
439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147FA 16392 bytes

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