Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ded9c42a7af9860…

MALICIOUS

PDF

99.8 KB Created: 2021-08-11 19:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8768cdf0be814b6bfcb8cdb4b1c8f4c0 SHA-1: 4f03aac241a5880f0b4c7a4490691d6db2a0d097 SHA-256: 7ded9c42a7af9860949ebee01645a6da7152477ac4bc9e7f8db5b96fe4fd51c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs lead to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=dragon+ball+z+tenkaichi+tag+team+mod+super+2019 PDF link annotation
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/bowibupaxisivoramaratopa.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/nkrcfc4sr25isvbe52bemrhsq0/18349143532.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c731b974043---50244686567.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fc3c2602bba1bd1aa5b7ee9708b88660/fadubesijaz.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/73325652004.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/depitug.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nhgmshdrcgm5itser4rld6o2jo/80974562075.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/d68e9852532e1f496010567928bc810c/20239066757.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d1c72cd7---58214215581.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/44116742192.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/tukopaxuted.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/71021691675.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/60656507351.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/63098496602.pdfIn PDF document text
    • http://simonide.org/userfiles/file/busis.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/fifewaxo.pdfIn PDF document text
    • http://ropesadventure.com/d/files/38144824567.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/fafulip.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1a25334d9a44dd5b2e49474f52316904/95887503445.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d99572c9---39467648061.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f34735b1750d4e48acfdefc7cecbf09b/jezabobezafirijipabujan.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26e044fe1---59701788941.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/12700077947.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/tibexofoxosul.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce8d2f5fc---getiwobepatefipisuvir.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 18996 bytes
SHA-256: 50673c0427590a9cb6c7f1d5211357b4c575fa667caa5bee1107ad674e81549a
font_02_sfnt_off00013d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7E 11816 bytes
SHA-256: 0c9d3e05acd12ec5d9de19abf23422c55af546fb4b7d2c5b1762d6167b45cd5c
font_03_sfnt_off00015935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15935 2328 bytes
SHA-256: 97ec669d954d95f7f11ed1d7b8736228109f07c966ab3d6524b1aa4964609446
font_04_sfnt_off00016387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16387 17904 bytes
SHA-256: 7e03e2002c3b0f4d131ba0ccd422b506a8d07a404bdc0454c15fe6d8df98ab21

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