Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3152caaee1d4f9…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 05:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2088b50cb530c2ce14a4120b2c12d337 SHA-1: d49891134f403c11b99f220181e93a21f083947d SHA-256: ff3152caaee1d4f96dcb007be378b34a0c982765db4d0c0ce66c5fc119bcbae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7ccbd5a6---nopiguwoxowokexarikoguko.pdf In PDF document text
    • http://pro-customer.de/userfiles/file/lijofumokujatikazegen.pdfIn PDF document text
    • https://web-dev.ethioapp.com/websites/lightyearsahead/code/userfiles/files/37251309048.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/97443882957.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/mebilatepanokekaxi.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/wudorovi.pdfIn PDF document text
    • http://falconltd.pl/cache/file/77017580285.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/zovogelakijop.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/lojutadefoxigarozudim.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/folegubol.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/87081983476.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/sogaguvux.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/15964826768.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/32932341220.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/mixanafolojapovilajize.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/lojalutadipevonevemiser.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc56e7428e---19404279821.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/nafinulusifanug.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/wejix.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/29359831592.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132cae17aae0---31234425850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+utils+appPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 10136 bytes
SHA-256: 18a2c228c436f87ec23b589f7986e2d4ef148f7bcb53d230ffcf0e03e99d3c17
font_02_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16196 bytes
SHA-256: 1eaf8ca4b0255d962fe88d4880a0f4859171dfd495643e743334ac2f2024cf2f