Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bda6bccf70d1d7a…

MALICIOUS

PDF

94.4 KB Created: 2021-08-01 10:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b80bdcd5b6640ac98fa6bccbf8f51a02 SHA-1: 542ace2fd8c338e26ede7964f960fdbb02b8adae SHA-256: 6bda6bccf70d1d7aa99a0ff796bc5b01357aeed0ca0da2612a3b6dcff7da6115
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The primary goal appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://thegioioto.store/upload/files/korukenol.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb04c9077---xuwozufo.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/mokuxunimame.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/mefefowem.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160898a11a69dc---36877656910.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4caddbcfbf3e906e1b3af5f6f84d6eef/vodiponifeputojijotovid.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/mb4hrvba02kthsbg7vo1fv3ohe/70807317751.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g8u1gpaq7o3ibo0ai88bq9r5f7/linasaxedebanomijefano.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d032acd2720---bapurelolewelonof.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32a5a6797---23416464375.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f43fe110b1060edcc4902d0ec8395c84/gadoladifobusagufiraf.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5932746b8---zabopep.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b762ae87a4---30384345979.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/xubame.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1b9a74495e862ddff40a6f31bc914c74/jivaketazan.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754263125c4---61516270617.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe0c074e37---zeteziloxiroraj.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/72220239378.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a569ab14be---gepidojuf.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/texixoxolep.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1d261075cb13c65aa8902c3105270a60/gitipenawajivedupakeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=division+de+matrices+3x3+ejercicios+resueltosPDF 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
stream_005_off00011d11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D11 20860 bytes
SHA-256: c161fdbc71e11d83e9d53bd23df053a3851629b767d219954a051c72c99360e0
font_00_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 11104 bytes
SHA-256: 5786a1a3e3594770bfb92c1bfbdd71599d14c3a987b6db1209ad1be99aa64df5
font_02_sfnt_off00015377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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