Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d735e4ba2ba2745…

MALICIOUS

PDF

80.7 KB Created: 2021-08-31 21:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d7d16ea1f7b26ff13923b82a5fd5d2f SHA-1: 8449a5b8b3637fe594f03f9b1d2c98bc7fcb2384 SHA-256: 4d735e4ba2ba2745fbad266e3f09ffe4e24e9ae8d54ed20f3280b10e9b118624
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or appear to be part of a link farm strategy. The primary goal seems to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://rauvuonsach.net/images/uploads/files/40547172556.pdf In PDF document text
    • http://getvisa.ru/images/File/52007090780.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/86717194630.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/71271b6f6d6926a8198ffa18415f2c0c/sirirexovikifaketojos.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/bavokifab.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/witona.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/rumisukawidebego.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/knem2lvl4o203ulqv99qh1vove/536987956.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210621102513_nhlb3i.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609479c262eef---rulizo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608629085a281---52449197920.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/tivuwewutimisadafuvivixe.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae038b7bdbd---xesijorewerabibuso.pdfIn PDF document text
    • http://ustunongel.com/image/files/10947463299.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e7b632fc428e969781089a9e4b819a4/sigaxu.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/20733851709.pdfIn PDF document text
    • http://abwessex.com/uploads/files/wajawanunebujifuxiles.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/zozoj.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/pajiramutesiz.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/73652063121.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/teguzakukatibupenotewuwas.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/34812596827.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/31165644694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=search+for+the+hero+lyricsPDF link annotation
    • 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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 10516 bytes
SHA-256: fe4480ee27e46fe2c874a02ec23ce795c0ced07390151ed76181e44b6b3bad47
font_01_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 18156 bytes
SHA-256: 3e8d1fea882a53fc81d280c0d771adf7fdc7d9749e840ac6fc9f108904cb7289

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