Malicious PDF — malware analysis report

Static analysis result for SHA-256 c355d1e544b69e8c…

MALICIOUS

PDF

117.1 KB Created: 2021-08-02 02:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d3867fa9843e453a7f897ab744b7142 SHA-1: 38cfa3844a08c9d368bd3d989d359376cb69d78f SHA-256: c355d1e544b69e8c45ab73361fb5999d55c0ae6696a8a138ac7d14611ba9194d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, 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 URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d515536de61eeb732f9621da745d31a7/robepijotitopupa.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/05f1d4e0e07e28aa9c99d0d908fec72a/vifalewa.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/84927510523.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50cd1ae6f---80162668462.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e3177ac4f5ac253a7adfe121d98c40c5/22535814537.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a0e0de413770fc7bf490697c5e1a9545/genifulevetutijetexu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ecc49b409cd83d1f7df45eb0828d5f1a/lulerevumutomozo.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3f686ffd9175ee8b49cb8ae8307eb991/sovinofibijela.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/47410075597.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/24819632377.pdfIn PDF document text
    • http://traviet36.com/upload/files/bufawukupipox.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/qmceuliljpg4mcelooq60pa4l0/nagumefejep.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/84647402237.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608189f49ab9e---57547718367.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/1jgnpn8ksi7vqjminkj9igkd3f/50905376899.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ced6a3bed4812faf315b4fd08f5bf0ff/59977477354.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/49604664091.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3878300ea9280117e7d13d3420a8f526/lawomik.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/tukisutenabarenogopaze.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/38086346508.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c019303d80cce98443913d9027dd4c1d/jerutazivuviwodepi.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/42063087267.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfbe05e926---gurenukixikikopezudula.pdfIn PDF document text
    • http://sdds.be/userfiles/file/6159463975.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b822cc75---78667567624.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/71989607105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=origin+and+development+of+sociology+of+education+pdfPDF 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_off000163c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C9 18832 bytes
SHA-256: 081b990d8355e55d003592aca9f7d3b97c4198ee1a4b71def11a3a7893b5c56c
font_01_sfnt_off0001932d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1932D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ab44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB44 11268 bytes
SHA-256: ca405ab3931ef863dfecd1ab782ed2160c2434e29db7232c7b3d51a3e0355667

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