Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d37ff62a4db8e79…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 07:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25e307873913afdf86d581204d6129fc SHA-1: 9c9dab9ab5c84881edb830ed6a75e0fe974dcab1 SHA-256: 7d37ff62a4db8e7973fd5b6fb3fcbc20f38614d5e732886622048c835c8f622e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, specifically requesting sensitive recovery information. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a campaign to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential harvesting or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://laborke.ru/uplcv?utm_term=symmetric+encryption+and+asymmetric+encryption+pdf PDF link annotation
    • https://eviinstall.com/userfiles/files/xekideno.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/55ab6e66080c75d51554766f8202c740/2075465273.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/eb846365c877800dfdb446d9416d8e38/36900561085.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/48537670720.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/8961716428.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g4sf1clbmukmgc8mnlo5o17mrr/doxevawowupifidututagapan.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/68269527866.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d795e14837---fokozagoxowiros.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/pijidilulabos.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/novavurulirajodusamema.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/linitenulilozas.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e49785784a7---revisesuzizafediweri.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/42647886101.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/pitolewileximomaru.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/vedaxanajaxo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5418993b---nimewexo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0bdc1c10---44244737029.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160996bcd76553---luzikafi.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/sunedawugeviravero.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/444b17d7e81a0739ff5c631cebb19e93/dinakilakofediripumoma.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608517b9f1250---xevijekobife.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec156f3b82---67575833703.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843826d87f---80956229426.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sasepakojuriri.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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 16876 bytes
SHA-256: 00adfb9a3abf5d81c3b95ee9ab84630e1d4658f8c8ad4c0a870ba125f5c69d69
font_02_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 10924 bytes
SHA-256: 8fed15d4b1480c7f07c07917a3bcd35e59b65617c2e567df758e25bd93ff62c9

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