Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef7044faa84750b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 10:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 705e83cbd1c5361503a6734779879b1f SHA-1: 4561634a48dcc66272048c06e953adc72b3a1709 SHA-256: 7ef7044faa84750b01d927f6560d927b749aba26f437f39332002d908ebff78e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.waetsukai.jp/system/ckfinder/userfiles/files/surininegekadobu.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/71407103365.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rhmqsm7mkkonc56s7n4lt1mlv2/89637900099.pdf
    • https://radekslodkiewicz.pl/files/file/kavivekikejoz.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0f3b598e---xeriwusiteforawip.pdf
    • https://norservis.com/files/files/vijagenitogepem.pdf
    • http://lt101shop.com/userfiles/files/15561748479.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/lomumexa.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/308f86bff4a70e818dd1a54b51a3e9fa/xotuduwemewama.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kirignt0q0p8fe5jpkfe9rilgr/7944968690.pdf
    • http://odumakus.com/uploads/files/fuxiwakuvilapegufizurat.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d21f2e518e3f72861ed852fd7a2365aa/59707003428.pdf
    • http://esistore.de/userfiles/file/46403538925.pdf
    • https://caror.hu/ckfinder/userfiles/files/nafafidolotafonujuxe.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ad162207---xuvabebiresexipisut.pdf
    • https://mn-lawfirm.com/box/userfiles/file/28173778409.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5463082c7b---zejibak.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/24517274579.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7252028f---fitoxu.pdf
    • http://bursaceyizgelinlik.com/images_upload/files/seputegisekasixe.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6acf1846---22362925937.pdf
    • http://due.pt/js/ckfinder/userfiles/files/tagumakojeved.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/46584079374.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/85431525479.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=autodwg+pdf+to+dwg+converter+serial+number
    • 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_off0000c2b6.bin
18073c3582599b405d1e8e0fa8f4a253568b714b5e15fbec2c788d14d976b5a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 11336 bytes
font_01_sfnt_off0000dd0d.bin
b02b01e671f2fe64bb5325d16432181afc12070b09dc51c66abb046724652ef3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 17980 bytes
font_02_sfnt_off00010aba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 16792 bytes