Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cef0d0018ca0be…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 10:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b2a478b2d05461a9dc992762e94b4f2 SHA-1: c4a02df4f6c1bf48c9bda625b6b11d5285a8548e SHA-256: 91cef0d0018ca0be7a32b4c5daa97e03a559fbeee8650e54c1fb2d4b2b69fc2d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=filmigo+video+maker+app+download PDF link annotation
    • http://polimak.pl/userfiles/file/53236909707.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/sazufotivotuwafasujobod.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/16017756035.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/zomabazotaxik.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/jojesowoxa.pdfIn PDF document text
    • http://koutingchina.com/upload/files/28995022558.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/rimeropusawowobisiga.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/zutiwisoxupobawago.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/delejobujipoguxa.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/53813203502.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e46251503d3e5cad03beb895f8b4d9d/zemodasigaxisedusubowi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2499e86e464640edccedd17ff1fad031/pibotuzadigateno.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/rowivez.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/fujaramopelik.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/kagezabel.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/wizimovesow.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/jekapurifijovuloja.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/59878587247.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/40168473348.pdfIn PDF document text
    • https://sim2007.com/files/guvaboruforog.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468c995dbf2---79698358438.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/nopurizi.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/80519254449.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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 17676 bytes
SHA-256: 0ea11a5d02837532c205dc2d5ef4eb01b73aa2458397afb8c3499714e1ff9a20
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 10688 bytes
SHA-256: 9d57ec22872da09899a4ca91c6c6bfe707f55ae0c114213044f01390891da81e

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