Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc088a476cbcf431…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 00:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d0d4985d45a2389bf1a22fc6c0687bf SHA-1: 427aba10328766300edfd205162025413179a70f SHA-256: fc088a476cbcf4319723d73522a5048c0fb5841cfd588d6c43e4d63bc51f9fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed19a5dee6---93960667667.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed493a62a---81336299161.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607070df41f6b---lemunijalabetajosexawu.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc05357e3---dakirujumiwojulu.pdf
    • https://micsys.in/userfiles/file/masujubo.pdf
    • http://nmglyxx.com/userfiles/file/4154671325.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385fa76352---firidujasinakag.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/9d86a7pdkoo9gsfvemehq0chn7/leruvemakewogogesup.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b671a04b---70217739969.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/13285249428.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e68c96211623405abb9ef151e83f9328/24321383680.pdf
    • http://guojingmall.com/userfiles/file///nuzezevepiz.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/60049589051.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811119e2810---poded.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bddb197653a77affeb2978011faa397d/59951286493.pdf
    • https://meganimal.pt/site/upload/file/fatufibosutinikivejuf.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rguulap19mhn1rhnp1cmvbvcga/wevonikun.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/71587835257.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d812a610b---23106937492.pdf
    • http://kovacsoltvaskerites.hu/images/file/22924333595.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/71309ce2afaca07c56b60d334edb702d/83833617487.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a2bffd0df779f8615c9b9b696bb9dad4/pevupobega.pdf
    • http://aldo-ins.com/userfiles/file/81538744057.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/estukeuehk33k1jlhn9q4d91do/lezomuweka.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/88cc020528f9c508f277e8d1f9db4c09/fiwaguzezepepagofuboj.pdf
    • http://forter.vn/hinhanh/file/96236678672.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=excel+pivot+table+dates+not+in+order
    • 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_off0000ee71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 16792 bytes
font_01_sfnt_off00010683.bin
ae7f89dacade435284d16da45a9d123fa4380b5d403680cd19faf3358748bfcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 16980 bytes
font_02_sfnt_off0001330f.bin
8e16f6e6c76b6a13e14614058587f5af9a740237ea2d040c3708b52d932a766b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1330F 10800 bytes

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