Malicious PDF — malware analysis report

Static analysis result for SHA-256 1008bd37000f351d…

MALICIOUS

PDF

115.9 KB Created: 2021-06-27 23:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c22e4d79e5524051bd52b030e3d889b3 SHA-1: b7ac85f5dd220858ca533477ed2f7a71742d8fb2 SHA-256: 1008bd37000f351d409f5810fa0dfec9daabf59ecd29b3059e98ca95e6368216
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farms hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=job+interview+questions+what+are+your+weaknesses PDF link annotation
    • http://reutlinger.pl/userfiles/file/11845791448.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/acra2dcsrft36r4rv0m9jp63cl/dunutuvavul.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e71b00c14---24303318992.pdfIn PDF document text
    • https://clinicscrm.com/img/files/77691155039.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/3jei944arc1o1v7o252tmrnboo/meteturikufa.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/loxusireni.pdfIn PDF document text
    • http://gptools.net/userfiles/file/doguvinuzep.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca41c22a6b---zopifil.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gobugusizubimifabuluta.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/24014234735.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/cc1d29535ae2d20f6182fccce504f38f/70210502779.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a0db68c3---fomenupuxejiful.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/wositone.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098248c8424f---gopexefokoziba.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/duxasobuzabusevowiw.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zumufuvefefidam.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ff6052d7---vizidojib.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081147c01520---katuwe.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607f476b9357a---55771521064.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/suxakoxifafemuxunuz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078671110b3f---48409270317.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_off00016189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000179a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A0 10892 bytes
SHA-256: d3b52e934399fd528aae473ec005785c3c860dbbb003e5986df9a9184d415394
font_02_sfnt_off000192e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192E9 17904 bytes
SHA-256: 14e02e378908c4551b6344187adcccfcdb2bf98309088ed06b98ddc3c797c88b

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