Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a749fdaf893d481…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 13:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10044e974ac75c8f791afb85377adf9a SHA-1: 4c80a033c4b498a8841873f5a5f8e3855fcfe84d SHA-256: 3a749fdaf893d4810959fcf721afd328c0b78886ff3aeda616db82bbea1fbae8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=impossible+road+apk PDF link annotation
    • https://kozlovka.mebel18.com/uploads/files/14034965357.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/44368771895.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/r6k2d80klk98ub9mvj17jae4ko/18544948391.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/ramiminegoro.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7578c10c4824e6b106ca17fba346ef0d/16338684434.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109032155231767.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149ce55397---31433946303.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/39456078655.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/93190853275.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc870fd68---wugenalevageboki.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/dijafuvefinifilab.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd7d2f151---sodujidek.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/pelojaxekalabarepas.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109041456547181.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/gewavagusugipudigiketera.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/numuraw.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lagiko.pdfIn PDF document text
    • http://le383.com/uploads/files/64457318041.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/pugedukozasosemoxu.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/32151811870.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/94455971265.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dh2oved3ugnsaafvbc9843e6o7/33061602703.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/pepududatogemofoxasazazav.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bd583a08d.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_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 10532 bytes
SHA-256: 1c3900f76edff0b8351f805895d2ec9356c189ac898800d9984e83e09de47a72
font_02_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 19348 bytes
SHA-256: 2d66bfe29c45e2374cd861b3a33578e36eb8221de4e69d07a7657d25fc7f0157

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