Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa86486a681d4f4f…

MALICIOUS

PDF

63.1 KB Created: 2021-06-25 05:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a272174260e67ca2471406dbde72bf36 SHA-1: ad16183522b5221525ada3f03d27780aef2e81b2 SHA-256: aa86486a681d4f4ffb74924afdb7f6f0ee1a75bfe286f81160a6c1725cc255a1
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ddf2679ddf3f89689d825e1c3480ee3c/mizid.pdf
    • http://budoprojekt.eu/obrazy/file/jerazu.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160918aea549eb---zifabepawun.pdf
    • http://daoltrading.com/userData/board/file/tujuketoxitux.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ov57sa47ko50pbrnq09p33dik2/53287883081.pdf
    • https://afayl.com/userfiles/file/jevelulafugagajokatezo.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acae85c98de---22267291566.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/bdb946eb3527df21d998fddd8b708d2b/95817395353.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7437f51322---73971611068.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/23ebc86efacfbb8b9366b2e8eed828d6/kiwes.pdf
    • https://cgeminfos.ma/upload/file/rolabovupexe.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/02180bf8eeb41b804d7b0a07cecebfda/nebewubitijid.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/pituvanas.pdf
    • http://ahlhy.com/uploads/file/111821403196.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/be7ssdo04er498h0mcd53o2p1f/gotonuxonafisas.pdf
    • https://abugfreemind.com/userfiles/file/zizosowadito.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/rilunubezamali.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c3a93c3adfab4e19543c66bd3e4d03f8/21876342243.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=archie+comics+pdf+download
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b775.bin
f1ab726bd8a45e102fd8617fce84a154bf901f611e80c651539ddfff3df12cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 5476 bytes
font_01_sfnt_off0000c9fe.bin
c06ad4de0806ada572fea9cdf3b5afe45d1f7201ee4e1c4ecd87153a361a6d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FE 10840 bytes

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