Malicious PDF — malware analysis report

Static analysis result for SHA-256 0030a312a91e5df1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 08:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 461ca50ac18519b46c1165f9b82482e4 SHA-1: db709dd419e972c28913bfe95f363591b892ff56 SHA-256: 0030a312a91e5df13932d5f6fd727dade7e59effb1b1c56aadef6f4b6c54c804
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8fd6d3651ace1147da922acec8451829/notam.pdf In PDF document text
    • http://vandientuchinhhang.com/upload/files/60436762567.pdfIn PDF document text
    • https://zhansq.cn/upload/file/wubudisixaviropewipadu.pdfIn PDF document text
    • https://empresa-venta.hr/files/6334852376.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/14168985414.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f9460e5f---65635425705.pdfIn PDF document text
    • https://cooperspick.com/files/likuwefaneme.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/25650295844.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/javovewotujek.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/19724289631.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ca568f82bbf71c9996467569f80857f6/58226192116.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a8db0db2---63079255385.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/87e437146d6604d57e3391b350528905/davudimajetajuwukikovuro.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/68830579471.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/44257411494.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/90458226126.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/xaxikugagupopemifadifadaz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489ae19d98---xilexiwomatuxiboda.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/86693238597.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/25efbaa7c31ecf9814ba32511e9e3b0a/68087093340.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/xusebozowosufogatanibul.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9109a2b1ffd64e880c239c2d3ea902ee/tewasenisabifigabugam.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/88466863957.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/46494146981.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1078f5419f---80669614305.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/rikukerakixemedezirotuwad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rar+file+online+converter+to+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/dobife.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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 17124 bytes
SHA-256: 7dab96c01064c21d82eed03eff589e853bb7265d749915b469bb98684f59980c
font_01_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 10556 bytes
SHA-256: 680460c057b5ecdd210953298bf347eadcf3bdf90b66e9af071f06cfc1952028
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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