Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77b5805a58d0dce…

MALICIOUS

PDF

81.1 KB Created: 2021-08-13 21:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: af6316a9368b3711fb19752fbc5f0b9c SHA-1: b4b9c03efb2d609dd03aba1ed76c6a7fd6d6dde1 SHA-256: b77b5805a58d0dce4b875b5d0a46945533e3d1411588a24349184f7e92bd823d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristics and URL analysis confirm the attack pattern.

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 http://1hozain.ru/files/userfiles/files/guniwevisovisaniwu.pdf In PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/fedogagaredomap.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/972df3c98ab8c7c1d702e1b1fa6ef3dc/givabaxabiwukuz.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/zamuwabopipedeguxavesawi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7spmosre7ks7dukumpuu1nb2u5/zinul.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7bb332219---15639047895.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082497d3b0e3---38549239892.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/semoz.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8b082422---xesej.pdfIn PDF document text
    • http://e-sportis.com/images/upload/98345006967.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tepiwezovevusitidodex.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cfd3a997c1e---kudidajafujobamekujil.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u2nr9rji1kbaqd3b7cc0ab2cn1/luzunakom.pdfIn PDF document text
    • https://csn-alliance.com/data/files/21701788579.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/92199135187.pdfIn PDF document text
    • https://telenovella-bg.com/files/mokelefiwov.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/mosonedilovojalezekiwajow.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab9d724c7---betogaxokesazanuke.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210724_040641.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/22541610435.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/19437773883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=attestazione+di+conformit%C3%A0+avvocato+andreaniPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3878dbd644bc8f9a3ff3855fd841422b/kokaludoluzani.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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 10884 bytes
SHA-256: b94079c7eff1ed6c551a8cc7daaa1e7024de4284fea2648eaa3a395da0f8297b
font_02_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 17936 bytes
SHA-256: a27875162c402a8cf94ec4c3fd615189e9fe0f72fdbfd1f5893d7387c131c169

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