Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a906e9fb069040…

MALICIOUS

PDF

85.7 KB Created: 2021-07-30 09:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8e948c092e41247168f5120c3779752 SHA-1: b9472d37db713cd163bf550c51cb49b7199321e3 SHA-256: 35a906e9fb069040d40694e295c0fd714b224f08ce65716b47edda0fe2189dc1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious files or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://eguiders.com/uploads/313681629.pdf In PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1k2bml3isljr6jpuib19jhb94d/ponefopizajekijepaja.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/eausgj0pn2geljva857ct7o4d8/90605309954.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/sih7gutma9l5fqfsb9j3sjh8f0/28670831037.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/gezipotanazejimelafuk.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6dbff1be85be1fcfc6195c92a719b107/12350556719.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d2c988fb---tisuwesibadimezuxisuwuf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608508caa7626---98179200114.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/36252521683.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/vinumipulop.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a2bdad6f---jesupirabem.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/770b50fc5f20a343fc813a5035ce1314/31311794537.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee454968075---60098371869.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c30abc08---rurenazavo.pdfIn PDF document text
    • https://mollis.rs//files/23664900477.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/7aa0c50f167026a95e177a809721cd4f/lapuladatisezi.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/jobapobegiz.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/jopizegikusiz.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/851eb31ef1502396c0174a9ef6c8252b/todefitezadobowaduko.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6e28ce0464c41692bbb7e81064b891a6/gupafirojawafevugazezidu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a132fd7ebc4be98b7daa0779e861b5a9/deranasuxituvir.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/visibapurofelubefanar.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/76236128584.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/393dd12da713852cc8f14ffe57478925/35710834060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=antropometria+arquitectura+slidesharePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 11004 bytes
SHA-256: 88b9870422023f388c8882045a57e7b1b9ba22c3b7dbaf05f9dfc2b05eec3ebe
font_02_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_03_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 1852 bytes
SHA-256: 2d3872a69fee5e831bf47713666d592c0a1b6584b412da5d40ed8cd8aa3c061c
font_04_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 17284 bytes
SHA-256: e97a28ed0b3dfd4e795ccf2662ce852d28354e4be54d5e6a21c8d765c6e328f0

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