Malicious PDF — malware analysis report

Static analysis result for SHA-256 a910daaa4a83315e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 08:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 093c83c99e52c5c5391d1e2fef56ff42 SHA-1: 332fbca0d3ba153d00dfbfd214faf5be526bae3f SHA-256: a910daaa4a83315e5a498eb33bb244d29b8c2502751f8d8ba2592e8e115239e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of multiple external URIs and links to potentially malicious content suggests an intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=computer+science+unplugged+pdf PDF link annotation
    • https://prosaison.fr/userfiles/files/xizapovewixovoxus.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8f8724c61---fivetelovigoduxiwisi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b471bd43d9e---86375933396.pdfIn PDF document text
    • http://ping-property.com/user_img/files/bobapilivevuzazekalejel.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/gunageruvosusatujaget.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16087838fd137a---46004530548.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/74086199656.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825c47c0ddf---kivajogemedikosapavaw.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/38664513363.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/94636764574.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/famawuzugiful.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086d55e95fc8---sifuv.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/fenatezobamatudu.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/29902502280.pdfIn PDF document text
    • http://nineslash.com/user_file/file/90120175705.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/bexexe.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/40774063198.pdfIn PDF document text
    • https://tigaintan.com/contents/files/70594867672.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/newatatomowut.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/10164290902.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/051debcb4662988cfc2541dbfa839920/galig.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/jevojizobexez.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/sotiromixewir.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/5q2hfcbpr1f6nsese8sesvbrls/jarogasekaxovoterusum.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_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 18764 bytes
SHA-256: e11932708bfe8d6e6f266f3be05990cc0962af187673dac19816a2f38c4145c2
font_01_sfnt_off00011772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 10932 bytes
SHA-256: 332f4ead7f50490ded745b27de1ed7951330dcb871ebfb49d6c82432c581bc0a
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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