Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0050f9e7857067…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 07:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c2c05df6153fb0c090b286f2fd72c9d SHA-1: 6aaf2f9e494645a7ee1ed641fa24950d052c05c2 SHA-256: ab0050f9e785706724e1d37e4f93f5ebcce7109666cb47d931ee2e7058ad3c2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning by redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=haircuts+for+round+faces+2021 PDF link annotation
    • http://ctyrkolky-gamax.cz/data/dokumenty/jalupezomen.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/vedudo.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/nanesa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f6f339beea42c558053117e77be61445/papevarejuxovasonadededid.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/92051929017.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69ee59bef---pukamirini.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38194609507.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/sexebapimorikawu.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/28862007874.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/tifudivob.pdfIn PDF document text
    • http://exosushi.com/uploads/files/19378219286.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613562eb058cf---napexupuzage.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/sisiketepugefijojavuviz.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/84533740157.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/tizexasutu.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/zidamilaxodavutu.pdfIn PDF document text
    • http://pvvc.cz/files/72670916880.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/17497448516.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/69665438790.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b36375593---tenurizulodaxud.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/53726667795.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7c21e606---93106231913.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210905183155.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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 17076 bytes
SHA-256: 966244135bfce13668839d31cd63ee7346c1e8afd2723a71b02c17ee226f5a9d
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 10808 bytes
SHA-256: 6377b72a674982be8801eb440d8c6614f2a1fc5e8afe28bead9095292378ceca

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