Malicious PDF — malware analysis report

Static analysis result for SHA-256 6626dd0806d7bb61…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 04:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c2744c0e8bfd2013edfe0e8044097f7 SHA-1: 432b9412d675a6946003f1ca7682eed984304446 SHA-256: 6626dd0806d7bb6154607f3517088ea87636589f76f2d0a41e21d070c59ae0ee
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 websites hosted on compromised CMS platforms or utilize link farm techniques. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple link farms and compromised hosting suggests an attempt to obscure the final destination and leverage potentially untrustworthy infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://stonebriarranch.com/clients/876969/File/277439966.pdf In PDF document text
    • https://liniagdanskzydowo.pl/files/lokozeduxisupololu.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/lijuparobutiz.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/4996073650.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/596e413a022c89581ad569d611862624/7059514405.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/5978066227.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/texar.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fapuvelokuxalojekeko.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126c7e10c6b9---zuvefoniwutubomubeb.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c940ff85993---lixupuxofim.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/52439770280.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77d9bed7cc4c6bb8920513f565e09f8f/rojofavowopugu.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/sumowufukamumeni.pdfIn PDF document text
    • http://teifsepahan.com/files/file/11142274372.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/04ujlgcor6rff6hm6vfu52oom7/pubikirudef.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/xatorur.pdfIn PDF document text
    • https://appfacile.it/file/fivakurava.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/64347886383.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/fujebunevisu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/96402576166.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/39582769923.pdfIn PDF document text
    • https://jambukuning.com/contents//files/kipobumuwijomasunedupavuf.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d95b86c4c---70701906525.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/06i53ihao97r6s0bkp84oq27c6/40060915882.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/18027334584.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/93858373825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=anti+federalists+constitutional+conventionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 10616 bytes
SHA-256: b67b0571945ea12ba6cb9df1add8184d019f86e7c87b18291c2ff81f05f37e5b
font_01_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 17184 bytes
SHA-256: 55d07c579dfd9dc465f867a1cf05fb40774aa5654d3a2d56320b38e512541608

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