Malicious PDF — malware analysis report

Static analysis result for SHA-256 021d3bd7d25fc846…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 09:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b80455a100a3585e84420faa9db42da5 SHA-1: c66dbd67db00e15e89b463e699cfc66d95a2f27b SHA-256: 021d3bd7d25fc8461bd76bd7308439cf9acf54f7714f08d4dac7f1f9c31315fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, likely serving as redirects to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/08552ba18a0f1dd561aadb8c4bcdd945/77878635095.pdf In PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/37014715196.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jivijufa.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ca13c778---lutifusa.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/55557817279.pdfIn PDF document text
    • https://capecoralliving.com/media/file/koxexegib.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8ea71f16b---melagaronikudovinasow.pdfIn PDF document text
    • http://cosyromania.com/media/file/padofavuvoxi.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/260307383248.pdfIn PDF document text
    • http://temple.mo/userfiles/file/86347366277.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k72eua444dqogiv6f1rdr33i24/desipikinowiwojuwagawej.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/wamaj.pdfIn PDF document text
    • https://menu2uplus.com/images/file/5997728034.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/pogeruzuvi.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/92982287389.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1472884f---28514245348.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/86019876916.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/faledexaxigosaselegivow.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210801215756908645s12711.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/devut.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d6934fed0---tojifuroxewifuzozo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c064ed1343---zadud.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/xetekaganujapofejug.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3bb3932a6---12913663560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=biological+clock+and+circadian+rhythms+pdfPDF 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_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 18048 bytes
SHA-256: 37a7b775df7240ea8393cc40febd11c226e9653733a680928ed3fe1f7d050cf1
font_01_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 11196 bytes
SHA-256: 888b7bc204735bac4654b06adfb6198a092bbfb4bd3964480e23799e903b18eb
font_02_sfnt_off000132da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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