Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abdd16a4a171f94…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 14:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cc7a86bfe77e3726f2e1da90594bbbbe SHA-1: 46bb74717cea3ff37b94983d275edd3a4a0c9d3c SHA-256: 7abdd16a4a171f94f1f0df10dbd91412e7c9a3b2d05febc239b4d601c34aa8ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yeosingol.com/FileData/ckfinder/files/20210619_7D8C15C46033604F.pdf In PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/wedikoxatoganovifagezume.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fd388a9c5---49250215981.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/75533590177.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/mcvtdstnjhjclkquvn42fjh182/jejitigababudovag.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/uvs3leo16ee2dncvl70ece0drj/sunexu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1de1e5e15---73693067017.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/zubelovugugi.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/49360681644.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pewefafazusalaso.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/papen.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c775b37886b---dajozamibono.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/34699222143.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/rh9u7o5qin4296uibv18n4vuu6/zixipejigikurinejakag.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/belofifokevovu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0eaa5607bd53e6bbc17206cb98b092af/42149412483.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/dudajeret.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2f6577b54619f20cae5cb0ef51caf98b/19500158719.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/n6ndhtt4bjli96mmsapqc78f4m/60770407125.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab35265ad98---muxoputuwoxewepojapazetaw.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/gsup036flbb43020ltq68mv43t/gifamejajefib.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d55bb615---mejirig.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/65964340030b5d464262358981613a16/sarakaxanafuseluliv.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160776d27a4216---44767709321.pdfIn PDF document text
    • https://chp-travel.ir/data/file/popavunovikif.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/palenidaretinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=strategy+model+canvasPDF 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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10876 bytes
SHA-256: 1134839e28abb203c44ed9ab7e50459d9ef5e1ed987c22bfd9725e780d03864f
font_01_sfnt_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 18020 bytes
SHA-256: 473364504e3e0c4502eed19da0506d76921437682e66bbd88add7591a7b8d31a
font_02_sfnt_off000137ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1