Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0ce05b3f63fdcf…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 20:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f970e5ae19a296f81534c562a1334b7 SHA-1: 1a7222cc264db199477b9f5332a1a4d7eed15fa8 SHA-256: ae0ce05b3f63fdcf3939c09b2c80983503061ddac79c7f3a01eae71037c6fd61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is part of a phishing campaign, likely delivered as an attachment. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://winecellarkeeper.com/ckfinder/userfiles/files/91031083846.pdf In PDF document text
    • https://tgvl.in/uploads/fck/files/72682722637.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/74171563186.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c12b58022fc36b033ec4e09eaa60a355/wonusejitixu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6daf3809aa9e8186e94b03c95908234b/tiduviri.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb80c39cd5d---22725248946.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/54911508166.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/sakumufofex.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210807123351040.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eb9d2950a---wilevikukuwebafex.pdfIn PDF document text
    • http://seamacros.com/upload/file/26700634955.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/timesobuvegunak.pdfIn PDF document text
    • http://chinazzjx.com/d/files/vaduxo.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/42328883148.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607597e6cb967---99073329516.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2ce3afff43656ad74d7b5fa4d2a9e817/zujim.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b18eb57f77f---24511185237.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/lelerewa.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/wuzirofiniluxupunulepuz.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/xawalazibumuv.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/11717880002.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/detefazakikuse.pdfIn PDF document text
    • http://scarpatti.com/files/81532868251.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609df618ceeab---24328195295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=intercultural+definition+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_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 10496 bytes
SHA-256: 61d11e855335f7510c9d703672b3f80033d51e7cfc18d35aecbf02774673acdd
font_02_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 17628 bytes
SHA-256: afebe1300fad8694c6d51011e46b42df033c4ef6ccd18f5dbfd23a2e5d0fb93d

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