Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f28fa2309428cdd…

MALICIOUS

PDF

84.8 KB Created: 2021-08-21 05:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 146644ce4a4683a58651379e1a804eeb SHA-1: 1e68b30d25c287bc52b94eb8768a6359814c7026 SHA-256: 5f28fa2309428cddd92ec19ab00616ea77f95124ed7dc9b0f16e12bb70086882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malicious content or phish for credentials. No scripts were extracted, but the structure suggests it's designed to lure users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6829

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bimetoor.com/basefile/bimetoorir/files/54579461747.pdf In PDF document text
    • http://angeladaniel.de/uploads/files/gunemixidanozuvominar.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4076d7923---23205689159.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783307a752---27926925435.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/sesazitusimorodepo.pdfIn PDF document text
    • https://bdata.vn/upload/files/sudizapeviliniresisumavep.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c474bb992---topajubowoxetipebe.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210820103612155.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vidukarukazosirodefe.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160881af744fc1---11252441322.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ead1ce7e4e921277dec147677b5f12ff/74679674355.pdfIn PDF document text
    • http://yjccnc.com/upload/files/molozikuvo.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/16559229775.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa2d048e9---rumonexerelizojuj.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849a8cabed6---74607381501.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/dudumubuxomurazoviz.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/lasuxakaxepefeberu.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/tuwojisojeko.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/migutar.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16078860b760e2---82261344268.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116dba9be0d4---goxumezotatin.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/7155581882.pdfIn PDF document text
    • http://computerdoki.hu/user/file/49032039779.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/24028997402.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/83973f4972dcfb6b0229b3c4701f5046/7612445751.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/bifumudukobezavuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=figurative+language+poem+5+sleep+worksheet+answersPDF link annotation
    • 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_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 11152 bytes
SHA-256: 936cd1adb90712bfcc0a780f479c8fa8d70436fd666b6874a115ed94745fac1f
font_01_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 18028 bytes
SHA-256: 3f47980db466266962235257d356a5ae0c6dedc3ef136158123692255b18a8fd
font_02_sfnt_off00013835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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