Malicious PDF — malware analysis report

Static analysis result for SHA-256 370061ca24523060…

MALICIOUS

PDF

85.7 KB Created: 2021-07-27 06:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd96d36f014e2b1514e3a61257810813 SHA-1: d834b5c5d92ff20ff5b2cd2c325f44f031e1503f SHA-256: 370061ca245230608aed7bcc5e80d27b1edafb40f4d20b80af81bbdc915fb5e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' and 'super-forms' plugins, which are often exploited for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of these compromised links suggests an attempt to deliver a second-stage payload, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26a418063---76697016722.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a78bc05b301---44047841317.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30cd3347b---29285746942.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31084419b---47553503636.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/qrjej5u9ms8ef5tbk5hfv5b0o2/56005635683.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/33953393592.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mvtie96cirglgtjdg4chuf9eip/87070593382.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210609095514986644pjzhg.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/51110257244.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609037c3ddc4d---tidadumodelinirisi.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/4788099673.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/xuxop.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e00445c3---minavifenufatagez.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/if55t55l7njoogqpr7q78ap3jt/maduvu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/42077201131.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf778e3bff2---madimurefagewiliragag.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/pegux.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0616/eb283b6a26ebbc429b53acbb8f70591c.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/63005452284.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/rukupujizuronevivifumirep.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/65283743286.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac557bc888---sipefetulaxafeniziru.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fde886941---lamagikivud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+harvest+moon+a+wonderful+life+iso+bahasa+indonesia+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 17752 bytes
SHA-256: 148dab1f7108e72583c3842203c4f34f3230b52f30cf1e9c32656686c519da38
font_01_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 11012 bytes
SHA-256: 08b3aec5c307a6cb60f5e320b88bef9f577e8508d866189b3fe87f26618ff32f
font_02_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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