Malicious PDF — malware analysis report

Static analysis result for SHA-256 0871a26d5b59163c…

MALICIOUS

PDF

131.4 KB Created: 2021-09-07 17:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e8165065a3bd0e3b3aa53bc035517fd SHA-1: cc3ec7d2736260d4fcd50fcc393f0f07ff29bb96 SHA-256: 0871a26d5b59163c111baa577276c57794715931bc97d591cdc0f3ff3376b10a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chi-kara.net/userfiles/file/pijojusugukanonojo.pdf In PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/264875db90c86c8d94a77c8ee886a29b/42116894620.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ddmb1a1jjdi51367d4frcikd6r/61709208998.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/467a265ffa5dd720839ba1b3c7b299ae/dubikamemug.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/23552440532.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/68669066584.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/31911005620.pdfIn PDF document text
    • https://everestart.com/images/stories/file/gomepixajapa.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/tageponifudilomeleb.pdfIn PDF document text
    • http://bakoca.hu/files/file/vowusaj.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/verupanisatogetoduru.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/45236077757.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609df5cb90c5c---97744833926.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/btddetkabmk9n2u2o10v3k1uck/23959395675.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082083e55d9e---baguwugipamivivevixado.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/detofesorefinetejo.pdfIn PDF document text
    • https://ms02bet.net/contents/files/sufowaruradovebokedaki.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/15080533839.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/jifr8e37vu09lc28u9noi85h00/90488298726.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/38921234078.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/rofane.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/37571846095.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424dca4f6c---78709633975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=analogy+notes+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19970 10576 bytes
SHA-256: d97c9ee7d97034fb87d1365e94094aae132099a3fefaedbef20c1990cb24e7d2
font_02_sfnt_off0001b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B197 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off0001c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C86C 21044 bytes
SHA-256: 1763a4c9a892b983be6b060058d8e82c87a3cea5841f1262421f861edeffeee5

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