Malicious PDF — malware analysis report

Static analysis result for SHA-256 74027957d92fdd9c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 10:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1c9d4ce7c2b200cfe20ed12e91ede35 SHA-1: 15b1d80ab1e7e8322f0bb31eb5db8e898d40b864 SHA-256: 74027957d92fdd9cc4ed264b905331899c201591bc871543c1df6cd590dc146e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=flip+clock+android PDF link annotation
    • http://artsar.pl/userfiles/file/24490796042.pdfIn PDF document text
    • http://japhina.com/upload/file/43015625501.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/65598232213.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148dbb4f0f03---11764865840.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161419f9392dc1---29668115344.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/dufidozixijego.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/70734874482.pdfIn PDF document text
    • http://online-cycling.com/files/file/lilubutafenuxusizirujele.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/42042148160.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/63453827545.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/53741506726.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210923_045143.pdfIn PDF document text
    • http://asid.rw/userfiles/file/74544986904.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/67666025893.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/13515139624.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/pisonidepozaramaku.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9112b20---dusitefegepuv.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/belavobuzurazitawojaza.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632010025.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/supizotef.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/57025174890.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef25f41232---lanatuwamodovofuxezopi.pdfIn PDF document text
    • https://telorgabus.com/contents/files/wotidef.pdfIn PDF document text
    • http://doxetrilinh.com/media/ftp/file/31333084543.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_off0000b358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 10176 bytes
SHA-256: 8a8f6f11c023dbbdf8f962a0a3683699bb2e61cb5952027211e0df05f48d99aa
font_02_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 16300 bytes
SHA-256: ba0ea7983801a55725fe03badd1da3ee471f68dd5ec7bfc9d136f438fe8df285

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