Malicious PDF — malware analysis report

Static analysis result for SHA-256 d781ec65562775aa…

MALICIOUS

PDF

89.5 KB Created: 2021-09-13 23:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6bcebf23f888a08424d414ff6028b595 SHA-1: d0b56dae4353b2fb9df89bf974f90e2f6e44331b SHA-256: d781ec65562775aa50e108a5c8f1a1ce90982e4feadb0c1af8778d199bbb68e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://vargyasnekonyveles.hu/kepek/other/file/kakut.pdf In PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/kibesapeludufomozixoj.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/sezujawobomit.pdfIn PDF document text
    • http://cbstav.cz/file/60064413947.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/79530233352.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a4b1sh4lrdonrqbtqm2leto1d5/58874783213.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/67097906239.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kuzibefipevijoruwixu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce1839d0d---80529511775.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe290af22---zuvoxif.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210908143715.pdfIn PDF document text
    • http://fittbikese.hu/files/file/zolat.pdfIn PDF document text
    • https://birudongker.com/contents/files/3902943393.pdfIn PDF document text
    • http://laserinnsbruck.com/static/lamubexusuxaregijuvapuki.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/ripozubaruzerapi.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/33209714489.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/jogubulawixukosakaruza.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/29220554764.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/44496685937.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/19960371190.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/27790340829.pdfIn PDF document text
    • https://goodline.by/userfiles/file/97410018330.pdfIn PDF document text
    • http://proxima-design.cz/files/file/sesitaxuluvol.pdfIn PDF document text
    • https://coevent.ru/upload/files/mikinufokidamavapewutegi.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fipajoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=helakuru+app+apk+downloadPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 10296 bytes
SHA-256: 87db45a9f8c51383dfd4d101bd3d9b9d35fd2b85e254f9b07508d110f972e782
font_01_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 24768 bytes
SHA-256: 40467260af7ba295370cdcad08c277851973a76678f983a1788e2a985be7f70f
font_03_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16900 bytes
SHA-256: 82872e4cb16b14cbf54470f861522c2c2ad6b05f445dde567066da997462bc91
font_04_sfnt_off00013fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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