Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb2ba38847ced3d…

MALICIOUS

PDF

88.4 KB Created: 2021-09-13 18:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1917ef81cec7e567e2c4e148c72b265d SHA-1: f6cbe283f79d11b94393e6f9c5fc3857f728b9ab SHA-256: adb2ba38847ced3d43a4e0939a2622ee0ae2df6f094e787c9ee71e11c4140110
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of a link farm suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ntep2008.com/UserFiles/File/43899418808.pdf In PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/99942888229.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/nijijufufusasi.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/bulaxobinivekik.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/28191846430.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/jenopezupu.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/xidodimig.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/jebivos.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/98cc42d45976334bb8701494f94dadd5/dopiriba.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/9086949553.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/fegojede.pdfIn PDF document text
    • https://kaimano.it/file/39511759575.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/25526654459.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/47057987190.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912070650.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309fff09c46---4036419021.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wenexogusomix.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/80184845328.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210908_6921708743A86DF4.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/81896344740.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/59094120463.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613468fa85de4---somuxazujazexupuwo.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/suxexupevugosini.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109061449219027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=uri+full+movie+online+watchPDF 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_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 17596 bytes
SHA-256: 5891857d95a7769c4e054b2095479121d153c0e9d932468b828c416013e4592b
font_01_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF4 10692 bytes
SHA-256: e9da2eae6872f10d913680d3b05d3b738988ed9888189ed33cd7c467e59624d8