Malicious PDF — malware analysis report

Static analysis result for SHA-256 7876cbcc119d78bc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 16:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa2efebc2b307c12d0f9eeca87fa3542 SHA-1: 25c429cc1ee7cd4483885b4b808a33798ba6b877 SHA-256: 7876cbcc119d78bc41890cb05d9229ed729e1836388e32349f881a6388c5846d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the URLs and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=godkar+pathology+book+pdf+download PDF link annotation
    • https://diedacorporation.net/freesiafiles/file/suxofupesuputitutoti.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/86226141048.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/67867809626.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/21bbfef650797c1e11adb970943a2a6b/3714598950.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/98709330935.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/68873554017.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37fccce6de---25662677101.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/55eed3117a34060c6e32644825118440/42528844578.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad1ce7fd93ee34872bbe5283a047fbe9/56926796983.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/83211677535.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/r8a54c59fe030d20g1phbno8r2/48383408822.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210606032413830692lxe9hw.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tdei10nvad62rebj0r8bbl2kd6/28829568922.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/3162238893.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/feduxifovupavuz.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1mv4ip8q0s680vs4i84gjqbnp4/vokidawemale.pdfIn PDF document text
    • https://blugarden.eu/file/66153442519.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b663502e49---79824645837.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/mikemaxiwoxesugakowedewe.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/dc44c53b960aa6728784e66d5b69f4e1/kinerolivinanalata.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/saruviseremuminebebuvi.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/wowuximujo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/613881ce822195596c72c4fe418a561b/70858472845.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0ff40394---pudalibokumikopane.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c173168a10a66ca323c246232d9736b7/fidituxibejoguziket.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/gilomuwunakufijodaluzubod.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_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 17876 bytes
SHA-256: 6f4b2d9ac99a6712e117a066ead5571a88dcd3243d42c82672c3b9c7957fa6a2
font_01_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 10856 bytes
SHA-256: 143f3a60bec2da604288e038c50b41c4e10cf7ebb741e00b46dd02851d9a1ee3
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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