Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbc89d4141a53e5…

MALICIOUS

PDF

87.7 KB Created: 2021-09-13 03:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1f49ad942cd5d8ec36b6bc788d02187 SHA-1: 68158d006a0d5f3f3bd5867603a6d6aa1145f657 SHA-256: abbc89d4141a53e51fe5e72cb7fdf2a61eb7cbca1cafe331950b0f455643332c
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicate a pattern of using such sites for distribution. The presence of external URIs suggests an attempt to redirect the user to malicious content, likely phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://bubb.cn/up_file/file/wanifigovopuvotiv.pdf In PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/jizedatedimev.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/38443635535.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161333676a9e0e---kufow.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5a95987e4a2c36d657202895d032accf/dulurimojurufipigagavuza.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/womurokepinim.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/93603100656.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/50519062569.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f9e29d8e2ea629c263d108f43fe44700/soneloduribevan.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/talokefod.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/gazalame.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/30748075127.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109130627152754.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/84481176180.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pekogilinigogupovukamebu.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/51048985011.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/susewezodopunutax.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/58693109941.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/65479564704.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/19105029326.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/joduzotapu.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109130302408179.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/kimoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nhung+game+dua+xe+hay+nhat+tren+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 10772 bytes
SHA-256: fee41e3c021ef8a3a26be366422535c4517569a9467058556b7a7d33ec59cb8b
font_01_sfnt_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 23104 bytes
SHA-256: 97d9b34b3db4170b7c0eef1d5c015ff5a2c1499a4c734e018dfc1cb2685944cf
font_02_sfnt_off000120e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000138f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F5 16284 bytes
SHA-256: d707e3381d1825b7537f622e28c3d5e47799795c638ace14622acd2dafed2c05

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