Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4e6b7596b62894…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 12:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5567ec24ef88d2b0980906c9513b3d0 SHA-1: 88647f97d838e974652903a3cfb2668f0475414d SHA-256: fa4e6b7596b6289423926e4a942667b7e3a9410f3fd672bc24a572b3ed23e869
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that has been flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a large number of embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://drafthe.ru/uplcv?utm_term=remote+control+chromebook+from+android
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140947312e5e---gilutuzunazex.pdf
    • https://mar3ol.com/Files/files/86008032414.pdf
    • https://ltssinternational.com/res/wysiwyg/file/51256515977.pdf
    • https://usssecuritate.ro/userfiles/file/jenosabikofi.pdf
    • http://kleinschaden-expert.de/userfiles/file/56541611738.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0ccad56f---77168142221.pdf
    • http://highendschmiede.de/highendfiles/file/87975265918.pdf
    • http://eurolocal.info/sites/default/files/images/file/90834263767.pdf
    • https://shinaltd.ru/images/file/2400649301.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/28620815107.pdf
    • https://tatsolarlight.com/uploads/files/wegasiwumosuvotavutapumo.pdf
    • https://vegan-eshop.cz/data/file/9270478018.pdf
    • http://aaaexpressheating.com/userfiles/file/92929119927.pdf
    • https://charming-dc.com/uploads/files/202109020719364284.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4fc80a2b1---maruk.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/95867069574.pdf
    • https://aqua2go.pl/galeria/file/13122332346.pdf
    • http://chukysovin.com/img-svc/files/jajilozale.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/46959800889.pdf
    • https://kimcert.com/E/file/ribexidegasusonalilegekaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad1e.bin
938fcaafa24afdb842bbf8820244efb26d09c94912b3c029acdd841e32259de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1E 10852 bytes
font_01_sfnt_off0000c5ed.bin
d6640e1c6282d132b1723094b1ccbf6f8ba98f6cedbece7d5b06f591523324c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 17792 bytes
font_02_sfnt_off0000f3df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 16792 bytes

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