Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2db588b2958b09…

MALICIOUS

PDF

92.4 KB Created: 2021-07-17 06:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5de037f646a57c5b7a36ecd13ab9b18d SHA-1: 275990c2f2530595192aa411f02a8658c325e629 SHA-256: 3a2db588b2958b09880fabb0adb93cca6e38622a339c25835ab54d4cdeeb290f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users through these links, likely to download further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc29210a40---3409590933.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b78e52236a4---sonazubogavudaj.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/35168906020.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/mibogulonum.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062001161479.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16084620b1e5af---32447186650.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/1845620046.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/jovibetetu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/90039873272.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/xotokoz.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8ad7dffe---lugipes.pdfIn PDF document text
    • http://www.shadowrangers.live/img/files/86385940987.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608355c0d5974---80254650733.pdfIn PDF document text
    • http://prosquash.by/data/42560358606.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/33800932245.pdfIn PDF document text
    • https://morabia.fi/images/file/40449312653.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/fcf04a9d7564c35e406782673ee7e8f1/rubagurukesebal.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cpvhruc1oudq2eg25qi3qssdq1/29049523392.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/7157545492.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0171ba128f---senotamew.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a69e221e0bb---numedodej.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/sewol.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9c31bde4---96680630882.pdfIn PDF document text
    • https://raljob.com/userfiles/file/pufisak.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/52227267552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=class+10+ncert+solutions+science+chapter+1PDF 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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 16780 bytes
SHA-256: e90c3681218d51b5be7240b9b1fccc6c48b07cc6d97a9d4690b32cf35b331103
font_01_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 16076 bytes
SHA-256: 0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0
font_03_sfnt_off00014901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14901 10776 bytes
SHA-256: 94b9d3ede1a93ac1285f84af205f2a3784f295590b859a1c1004faedac133b76

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