Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d155d5eb2cd13d1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-05 08:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ab12b534b81e68cdf44230c0f3f6322 SHA-1: e2a40faa1805b36cce91a1494bb44b6124f14179 SHA-256: 4d155d5eb2cd13d12c6afb1fbb010b507b3f5dec0a273b9ac28c1f43a3e20750
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=have+has+worksheet PDF link annotation
    • http://adamlegal.com/userfiles/file/tosetowotegobatojapofon.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e6f2e8685---34639431607.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/mofubulosodaboxiji.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/laxigesedovawisodi.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/mapevozodirug.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/ziribunixodikijaxo.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/62552098301.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210623053559903190793.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/532ad93e22076d3160da2540cb378691/29317590854.pdfIn PDF document text
    • http://apsons.eu/files/file/lonufareko.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/p9facgh29du0ufib7lb03gqmqa/66162515736.pdfIn PDF document text
    • http://ipceurope.com/assets/file/ximimukuxe.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078027ad86fc---fuzuwikiwopofisix.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tamulokemudetemanusagufu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ecca8630---46452723526.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9887217719db61a4729f4f8c6e52d633/poziviguwoxejumokus.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/ripuwekevizosu.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/30660376060.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xuzidew.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/hjqlds8legephu2p4vah9m1em0/25093714564.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/18622077917.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/b6b380406a968665e1a6bf182f061d47.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540089ca29---wozideladuvironoxinaz.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_off0000b478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 10196 bytes
SHA-256: b24b366056473433dda9155596fc6de05b4a645ad9b5448c41e5d13e6595eadb
font_02_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 14908 bytes
SHA-256: d87498d8dbb6de54d89963dd3fa34ef39c3ea1b0dbfe8dd960051488c6164520

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