Malicious PDF — malware analysis report

Static analysis result for SHA-256 803990cd6003c7d7…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 18:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e970ef711b25354f88fd4c8bfe1e5128 SHA-1: 62e83d48ed0d00c99f2316041681f1a68a103fb4 SHA-256: 803990cd6003c7d7c1af5b278c02ad4125aca841077add825fc674ff1b11aa88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The presence of a download button lure and ClamAV detection further supports a malicious classification. While no scripts were directly extracted, the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/cm4srap27bdinv083fvm319ri5/30907323189.pdf In PDF document text
    • https://hr-serdahel.hu/images/file/suxekapexevopezivo.pdfIn PDF document text
    • http://llux.vn/uploads/files/lobowukuburej.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/janod.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/35813128238.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/60422525782.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/radabifekadidowoni.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/68f92f9a03f0fdf9d6f0d6a2452d9483/60059461438.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/bazuremi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f0c27b04---9324166570.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6b3c1b2bf27242cdd3fed356579a9534/bugijafezofejeno.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/zuzudorilexerigazolijew.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af1c6a430f---lopareruzud.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c5eda924---lakimivaviwazomep.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3684957f1a---45843026259.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/52095897101.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade716d8655---28374666415.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51732930733.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2ke0r3ba1p9glifunoegnouvf3/zosog.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829fc5404d0---64658514655.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607820425fdd0---ruwomijok.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791bf11bfeb---rosowotavinot.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/77680420291.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/71584884639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+boss+baby+tamil+dubbed+movie+downloadPDF 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_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 16920 bytes
SHA-256: e38081e4a5a2d3524813d9ee211ee83d2bbcd021cc70b0367a7ad4e52d1efdbb
font_01_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 10880 bytes
SHA-256: 8a83b62f78d95fe3ca33490e7efb0f1bca29521e8e02cc6fffeba8b3f9b859d8