Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7cf29122f0bb67…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 07:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3173acf9a10312334c4b8cb113a608f0 SHA-1: fb0990751d4f816a74b1827c56d11e9c521d7873 SHA-256: 6e7cf29122f0bb67196a70d702d99ac96601e74c5d9dd29b329026a2c38bc606
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which is consistent with a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://orem.mn/uploads/files/80381998406.pdf In PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160854961488cd---tozukaruvex.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a4683170---78511301684.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/65735922516.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/benagabap.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/dobonaguzunopa.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/501554ddb952ea7a97690431697c9806/polakexokawukanotifiwet.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/abf73aa103503e61b1f8f1749cacbd0f/66993207400.pdfIn PDF document text
    • https://birudongker.com/contents//files/8028481405.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e75104816dabfd14ab8cfee232cf59ba/96886829290.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xunitubakujodakis.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/zunitebul.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610104a3904aa---14322620361.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/31857794935.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/11437149893.pdfIn PDF document text
    • https://hsse.cl/files/48259370036.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d1f70461---nijepoleletuxewupe.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/nuwomibajinoramitopaxajig.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42bcd7720---rurigusupetopok.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/lukepimufubop.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/xojax.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d385e77b7a---91707818086.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/fegatisun.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e7385f16153c4db88be509b646d499ec/55825243799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=photosynthesis+diagram+and+skit+worksheet+answersPDF 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_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 18020 bytes
SHA-256: 0fb17d3c6bffd6b1e44b1596b3979ce5c465302e3a1ae017e318704970cb9f09
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 10944 bytes
SHA-256: 09fa386b20ea3a1f4651d1c43d578203fe284216c94a447491bde5333c1a9c21

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