Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e61e48374036ae…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 07:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1af3a7e16a35cff7bc88da6ebf33b896 SHA-1: 1acae58c7741aa80e2d015c3a5e273f90ca06c97 SHA-256: 74e61e48374036ae6ba7d6db6ca6af9fa459d9f17cdfaf965226fe899748cff5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which appear to be part of a link farm designed to obscure the true destination. Several heuristics indicate the presence of a link farm on disposable or compromised hosting, and ClamAV detection confirms this PDF is malicious, specifically identified as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=java+pdf+compression+library PDF link annotation
    • http://rescue119.org/userfiles/file/zowes.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/mavopotisojudawikezog.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/fuvowaxog.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/dijabiwanowiw.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/94101528928.pdfIn PDF document text
    • http://fitviewer.biz/files/file/13856794736.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/mepezizido.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7af07af4---jubagudivulowak.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/64010625336.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/51988012347.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/76416382173.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/970j7tnsf5jh95u2nr6skkj1tf/wugavasedo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/42806161442.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/85466623147.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bumelevanomonebigenuwube.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/95677671609.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/62359454600.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/wowutedupi.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907232537751564.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130527f6ef1a---piwefetogitujeperogefomud.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/dojijejowokovo.pdfIn PDF document text
    • https://123natura.com/stockages/files/vixapevobez.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210913194548_ODIyMjE0NDE4OA==.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/mojafutudib.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/nadenovurojeviguloxeribu.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/81926737474.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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 10992 bytes
SHA-256: 9ae3c90c0b7c5e65258299115f1cd92ffdfad942e162563f7f4d8869c3753533
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 18264 bytes
SHA-256: d34b234145b223d3bd9deee9b45c6733edc7c4933cbb069a2f93b7e1eeca0293
font_02_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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