Malicious PDF — malware analysis report

Static analysis result for SHA-256 9614b387f2f77f54…

MALICIOUS

PDF

123.5 KB Created: 2021-06-28 17:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1c9a4fb55ebe1d5431f1f2b70ba19e3e SHA-1: d2f2fb6a4c9f424800d7dd0b53579d476c41a78a SHA-256: 9614b387f2f77f5404f6e587c30920adb918d83517fbb4eeea2ec0f27614a80c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating it functions as a link farm. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt by directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9576

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://preprodpcb.com/userfiles/files/94024991848.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9658dd0405---7974943091.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/55400692966.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607140945b500---pepoxinovitezesaz.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/vusoxifawezefigofe.pdfIn PDF document text
    • https://raljob.com/userfiles/file/36949434214.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/wijumizibew.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/lv42g9hh0gju5du01qbg04oc26/fetibenuladiw.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/nenusopetosurazuda.pdfIn PDF document text
    • https://webmenuplus.com/images/file/61834638447.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/91075266066.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14cfefb52---pidux.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210606182953.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b0a9102a9cc196778c8191cf44726a1f/34138884197.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/35017e5e0aec02b88608f988a75ffd0c/dulafixu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b867a3555---mafope.pdfIn PDF document text
    • https://aaaxxion.info/images/file/poputaj.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/1713866499.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/109b735ec772b17af571c65f502054c5/48291353473.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/tugokam.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/29ba705f149161effd9406053a3ee8de/83892943671.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc362c1df26---kepudiwolutadivok.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/mebaxi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c89f552e2---19736150046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=almighty+meaning+in+punjabiPDF 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
stream_003_off0001623e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1623E 17324 bytes
SHA-256: 85dd657231d5742a40fb6692d3bc57e0df3ace95990673dd41bff5f6e6be9645
font_00_sfnt_off00014a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C31 26700 bytes
SHA-256: 444e4e2e048558790779d862cb6e939d8cd96934336205de394dc3e2531014c4
font_03_sfnt_off0001be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE58 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_04_sfnt_off0001c798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C798 10776 bytes
SHA-256: 9b65774c0bef7318a1ddb92e1e0acd79c2b121a0d99d98d931bc24613e8d2935

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