Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f1ff24aecb1317…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 01:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b39d21066d34600e7890589513cff5fe SHA-1: d0cafbb55c55649ce65c962a5a7728c00a48ddd2 SHA-256: f8f1ff24aecb1317124b38413a55df7903c9338dec9096f0942d9192c4a75121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=free+download+mp4+to+mp3+converter+online PDF link annotation
    • https://gujaratisamajparis.org/upload/files/mitakofakuwazilazuriman.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/43135862817.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ffa476289---sojujukefonikopagabajan.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/cv1qpg236u6h1dju4n7er9ner4/77007261141.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb58f0c80068d5f99471e90dd56120c9/41148627094.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321e576a9fa---varofenekepozubiweroxiraj.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/db705be2c7ae1d4a2fd7ad7e6eff71b8/52060650263.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/bunabusaratedatax.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/lenizevimuburuzarobokusef.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/bukewirefidixitekip.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/vawupatuwizimalakufaji.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/28551397985.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/sedariwobur.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/58415046903.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/98054378327.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/wamiwemejijekegedamuri.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/99651211602.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/15377734872.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/89523478118.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/9150237531.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/25628636448.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/zaxutejebamepazera.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/xoxepij.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/tiloxagupoveli.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_off0000cb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 10884 bytes
SHA-256: f30ddf63da4d74bda59e0eb12fc72b7fea79ecfc3ea25adc8eee9bf2c593ec25
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 17172 bytes
SHA-256: 4ba9df92ea64ed2e67f9b94e63b74572220d05d8bf847cf1c7f3c6585059fc0d

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