Malicious PDF — malware analysis report

Static analysis result for SHA-256 3364acf453c4cf51…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 02:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d5fe25db281b8ddb84698169903c41aa SHA-1: 464d8aa8a4e42436e15570cda6d6394fa5067081 SHA-256: 3364acf453c4cf512750a90c08b3b3da440650feb73f0a42c615dff922f6135d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites or download further malware. The presence of external URIs and link farms on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://huntic.ru/uplcv?utm_term=pokemon+sword+and+shield+video+game+download PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/mnp7s6dspk794onc5979iusent/17475179735.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/p2ripkha5dnpqgllhvhp7osv06/rejirefupalo.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/jikefewiwadamulegejin.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6315aca81fc91eece2a4a4e8a749c348/95661377535.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/zonikizogubi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5e9efcc5e6ecd1d39568964a73610b31/76779998568.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/khs9s39nl11ec8esht3o672fv0/kiwopatupoteru.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29f7dd96a2---fimabox.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/34c7f3380504f48334f061c6e2e6dff8/96655251845.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091276b6c12e---52859384218.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/733e476b7fee0e32e83ec7ba72e97510/xapemomusu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/072d070e0537338969de6b1971b96ccf/pujuga.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/81495tb7ln1q7it0m6k1ft5pen/88051574434.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/591620987bd1cceea023df3ce53986aa/86596169617.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7e27574756f62b1842bc1c119d322a31/1831991536.pdfIn PDF document text
    • http://c-amc.com/upload/files/99688504988.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5295022da---10164156543.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/gebofotewafenufakijudin.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/47222550587.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762fcc1a499---lojekazapebonu.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/munadamikalotisaguvejeda.pdfIn PDF document text
    • https://puntoagricoltura.it/file/zuvaniranonujododon.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/l4b2uv2ksdo71rvcjv9evv7nlq/fodez.pdfIn PDF document text
    • http://peak-experience-japan.com/62751523416.pdfIn PDF document text
    • 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_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 10844 bytes
SHA-256: 180bdfce2b03238f8f5661f5c446415bb2ffd1b899e838b756ab1c1a58e922f0
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 17288 bytes
SHA-256: 5501393e97ccdadfa58ca711f621509d9613c4981804987a016fde610c3e08df
font_02_sfnt_off0001318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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