Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ee704075e33b4d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 20:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bb66beb7d4bac132c7bc2c014e2194c SHA-1: 3f84a9d656be7bc5495898bb8cde37851bf722d7 SHA-256: c9ee704075e33b4d41664bc59a433e1e81d8bcec0fdc01cad1f8258103d81392
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pistant.ru/uplcv?utm_term=convert+40+degree+20+minutes+to+radian PDF link annotation
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/aaad168cd6c16d6c3ff65d9a5d1cba1b/jajunav.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/mitopolota.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/95511082487.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/sunima.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210928145445_l9sysh.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f476b0c4c194677910da08e7fd5af74e/jupulajebibozituvu.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/97060649798.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbb77ceab---84937679071.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/72881676618.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/dd2da92854404b2ea1c68376d2f6c44a/57613270933.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/gelusozasopobolosarefitus.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/41199502569.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/92592114349.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/90573586090.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/mepativodajozegib.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/tibipazipusaxupi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d9b3ece9a51f796f66217f740bf41be7/zibop.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/likeburubetiz.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109092032174200.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/mifabagositowifuvogudux.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/77354251043.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/jepor.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/liwixerisasajanisekomop.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/64639882496.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_off0000af36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF36 15296 bytes
SHA-256: eab7b93ee1228266a9fcaff6b5b658fc00577fc5f639da2ef4c5636931be635d
font_01_sfnt_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 11060 bytes
SHA-256: a8f8397eb7061bcfa0fce519c958c8748725a8cf49a2510764a31170e109a67a

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