Malicious PDF — malware analysis report

Static analysis result for SHA-256 701c4f683bf863cb…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 21:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d57ac2fae205f121fa49cd603dd49cd8 SHA-1: 600e8d290810e78891a0a4765263e4c8cc1ae49d SHA-256: 701c4f683bf863cb6caf038dac035fe2a870a27be06757e8305ed92825b0c497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user interactions, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=partial+fractions+worksheet+pdf PDF link annotation
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607921e2611c0---makenibexitesirup.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f6c8b0f80---suwujupetubefakovatijoj.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/kakitedodazig.pdfIn PDF document text
    • https://arerp.kr/data/file///jodofepus.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/wasixamugad.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a31862fc3---dawabejetosolagiwiwewadex.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/34372594415.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/81902289703.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xuneriboregegunosuzete.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/47105612255.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/79165508509.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090db4d81d7a---82129742486.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/kitasowukowum.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0927ad72---tisekedimukazatojinumis.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc9205cce---72236540652.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/70275524508.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/38935831026.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/831f1fd916305d79ee3b422b17a877a6/27415379711.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/86679761294.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0s9rs8qc83ptc2ojuamf162jhk/kakowazopenerojiw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160907ce93b496---23478499969.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/482ee4698dae3da9cd0af161b81bbfd9/xemiwizopobewikoxafudokit.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eadb1f847---79824706888.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_off0000bd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 16500 bytes
SHA-256: 4c0a990f3e45a412fb0d601fa726459053b7dfe439615a97138469eb20183dc6
font_02_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 10896 bytes
SHA-256: d4ace821e2f0862fc3bd09b4f988ca3c80caadfc77ab6cfaf4cfac76d25c6594

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