Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b999610107fbab3…

MALICIOUS

PDF

102.0 KB Created: 2021-07-08 08:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7008326e864308547cab97347a37a7a0 SHA-1: f18ec2652c0a12294b5fc6ec570b62140c185921 SHA-256: 7b999610107fbab3279a00a6af5b60e10756271e58b6ca7d942900216244d9e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for a phishing trojan. The file contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be to lure users into clicking these links, which likely lead to phishing pages or further malware downloads. No scripts were extracted, but the structure suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703443e4858---53990086658.pdf In PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082530c0be4c---xebagimijel.pdfIn PDF document text
    • http://bakoca.hu/files/file/47751474229.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/mutojapiwed.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/xerup.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/16669741649.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f94a02e3290066649c3a2d5f9055658a/46317199056.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2357c8e85---89927900598.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/sufosuxenumeboganoxem.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/557abb5a47065b6ccc3c982e3dbf995d/vafagorola.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/54682835310.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/39130682670.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925e13d37d3---zuxizumut.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d7e12a5615bf00da8ff5f974b6c297e0/kosibiw.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc76077344---siliporarulipenarowix.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608213e638244---wematu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/hmrdvq2gevolb7esgu2gbpbnjm/71357715665.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083373dd5548---36192393748.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5mqlpmtkpjolob72do0hb2pnlh/pusenivonal.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/22082227b275db9e0713e57deace6ae0/vesawezezigevesaxuvu.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/faxazepak.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210605_52587B7BC79338EF.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0c6d080d---kasakijafefidinube.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/t3mdv67e74n18l98l4mvpq3jb4/66864568546.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/79485539416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=i+want+to+eat+your+pancreas+plotPDF 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_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 17960 bytes
SHA-256: eaedb8075628133a7b1b0ba41203ba29ac56a9c4a0d917f682ba31423542af14
font_01_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001478a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478A 10528 bytes
SHA-256: 221c56e5b272fcefc6c12e1ad036862e18f9717176c7bb6db5b143f7d6a6cb55
font_03_sfnt_off00015fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBC 13472 bytes
SHA-256: c902114f0e923d8b5612ced2d81ad5f4107c5e144b284cdc35835061f1d0fd53

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