Malicious PDF — malware analysis report

Static analysis result for SHA-256 764de36c0cc2eb34…

MALICIOUS

PDF

91.1 KB Created: 2021-08-15 00:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5ee1a77f63ea226dedbbe074524657d SHA-1: e90c8f1cdb37443fb48f30f7d7e4a2a2ae0e710e SHA-256: 764de36c0cc2eb3467b9f8abfe7c2e34989436508555402ed442d64cd92c146b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=download+pci+serial+port+driver+for+windows+7+64+bit PDF link annotation
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b336cdbf0d---74928060741.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sunedo.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/35507249923.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b006ada5782640419a244587c11ce14d/wujano.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160804fc7642f5---pasezaxavijik.pdfIn PDF document text
    • http://kgmda.com/upload/files/peper.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/ruzaxa.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/57272891983.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/lipmqc1jkigvoikg77afap1412/86015708688.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/pibanetojojokogapopupijim.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/mizidalaxiru.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hq2oh87pset71b4e22ce4vcilh/40259741354.pdfIn PDF document text
    • https://tepihtrava.rs//files/323034590.pdfIn PDF document text
    • http://kodemari.info/data/files/zurijinitelakadujigap.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087628fa999f---46253100862.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/temibikogusuxuv.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/0e1c97818652a1aeb5fbd46ca72cb3d4/22659781172.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/vexelekulotap.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/kuzanetedivugerapabup.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/bilewedalefilowebes.pdfIn PDF document text
    • https://webmenuplus.com/images/file/49059334810.pdfIn PDF document text
    • https://amblamy.ee/upload/file/50569295575.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8ma28f2fqmjf6rmi0sqqbqldm2/sovukiriwepizo.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/31736957526.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d95e52c5---zupowazomid.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608935854fd21---83614482869.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 11204 bytes
SHA-256: ff5230224663e083b44a5aa0ce893055a5b855a04596f0f885a446e290ce3b3f
font_01_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 2688 bytes
SHA-256: a2ac081e08affb0ecf0a940f0eec8b4be73ee6624f5ae6ef3b741cdea718dd26
font_03_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 20384 bytes
SHA-256: 3e223e2b2af403bd55cda2d798fe298a104b02ec442debca87e68c2bd24b2c98
font_04_sfnt_off00014589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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