Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd51b0f12c5bb10…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 21:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 65b013bedf120e0dbf64929c58bac378 SHA-1: 73a950e6e655e2efc6098dafd88405775a047dbb SHA-256: ebd51b0f12c5bb10c185a0fe019748104c8a95249e22b8a145f72d3ba0541bd6
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/29f6f14750eb1f0bb7b2adab19fd3d57/12178841210.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ba476ee8e26dd962fa04b1590e501761/kutuwuferejeniz.pdfIn PDF document text
    • http://swhos.com/upload/files/47496211282.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4949a6ab---57932732916.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/27264392528.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/xilazogafan.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5786c9e4---botamuzoluzogupor.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109121611429143.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/xajilul.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/sakufejajaxezugen.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zatowesusizuwu.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevamevogogejalapapadaxo.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/89070212438.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/wazikobuzijufiwafemuza.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/45882559889.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gosisedare.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/pesuvexutusokekeg.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/26404506491.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/pewawudanirose.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/81756943760.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/ragipirag.pdfIn PDF document text
    • https://timminsrenovations.ca/file/wyiAf3TPP18YUSMq.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/levuxosirazapunizegag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=godzilla+king+of+the+monsters+gomoviesPDF 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_off0000bccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCF 16592 bytes
SHA-256: 44ff3ee4481c4e17715aa4a2d72f1f6603d92ca2d86f38b05fda470a6db2baef
font_01_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 11060 bytes
SHA-256: 13f807e2a0a632f8dbbdeda4c28b2d86c20d6fc05c0013d4b5cb3f7e9c93d691
font_02_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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