Malicious PDF — malware analysis report

Static analysis result for SHA-256 415a9dd1bf0c36f3…

MALICIOUS

PDF

87.5 KB Created: 2021-08-17 06:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5fa5d9e01ac8517a57b9bf19a60cb78 SHA-1: db84f54da98e013423dc2430baac656e2df92060 SHA-256: 415a9dd1bf0c36f3197a304b0b1fcfc06f3248e5558e101efcba7e4627ca9000
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. It contains numerous URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used as a link farm on disposable hosting, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=california+real+id+requirements+pdf PDF link annotation
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5da76589af4a9c11ef281ae3ba3f1a9a/46947647131.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2801148c3c---74942221207.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/651a6fdebbbd83ffc6d32484bcca6cef/goxapodefutefi.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/27613506774.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5523a4d48---penigemukokuk.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160daf238748d1---bikib.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/veliromizafopubuta.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/sexosip.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/4705014954.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609352e0a657f---biwemevogejoxa.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/95654114378.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/fugosofumilidarozanufumub.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/81772046061.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9719118c7d41748fdcdcdf0429134292/putiladenebo.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/69405992415.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d23f392e2---kobamezomub.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b526c3335f1a1f2484324e02837e8185/marubifokoluwutu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094894eaa2fb---59654534000.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/ragefefusodej.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/43516065912.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e3d0810e1b7f1d3a24f5d48167a58d82/17482966809.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2eb7a2b9e50a929e6dd0dd903520fbac/wubumemujileduxekiv.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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 16708 bytes
SHA-256: 2fe7ee907a780562d3a7881fca34090e7bf283a665fcf3df8d5fdea0178c0ae0
font_01_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C4 10936 bytes
SHA-256: 441aa7bb8e2442aa4517513eca2d7c087ab488c07e99e7cc239934f17886cc02

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