Malicious PDF — malware analysis report

Static analysis result for SHA-256 2283b2ea2c500184…

MALICIOUS

PDF

108.1 KB Created: 2021-07-06 13:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 720aa7bb89a3b4d7ad416e8424aeb096 SHA-1: 29645adbe404ce187f98980fdc14c5dbc3972a98 SHA-256: 2283b2ea2c500184cb1dad4fc5440fe8655b82cc74b33ed2d840308581e2fc2c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links pointing to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=various+types+of+store+layout PDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608387b4cbf6a---febigotebikupibapog.pdfIn PDF document text
    • http://eventechsite.com/files/files/vagis.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/2c18b1e097660e02751f13d689a07627/ruzedumamimetopuzemeponop.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fab35d619---77655823186.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/67024096893.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/48607427300.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/05a136b2256405f323d56146458d6285/69691728388.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8044c96744---18816805807.pdfIn PDF document text
    • https://bloomeng.com/uploads/xukadepakonoratafix.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160748c4bc9acf---duvibawarunoluxomaf.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/59137583264.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/eqaf8bgvo8u33nra2vobbgr0t3/89001903946.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81c3005864---44075878990.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/67564319133.pdfIn PDF document text
    • http://strandedtattoo.net/file/41230987421.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9a58139a5---pipixosijutumoza.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc5b101619---naxalu.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/gokokokexevu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a968e5e6971---koximorigebugokaz.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/savefijimotux.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/dejidedosofenezedix.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1a14a583---sadazutarunipofuterowe.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/depolijulojafotewowerida.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/dv2tbvq70q4aj001gks6kd4e74/6674896255.pdfIn PDF document text
    • 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_off000145cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CC 17324 bytes
SHA-256: 75236dacb73e096b2c110e1dbbf210348288de790c8dd6527ee3da5d0355c10a
font_01_sfnt_off0001733e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1733E 10428 bytes
SHA-256: 7ac3cb2ff0901c4ef412e52ac4c88618417e6950e7b1582c1286574a226dc50d
font_02_sfnt_off00018b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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