Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c52e6e1bca526a4…

MALICIOUS

PDF

90.8 KB Created: 2021-07-28 01:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f4f27ed5eee5750d3e5b4e4a4b01233 SHA-1: fb1d6daf4e2144f886b451dd05cdc2231f1564d1 SHA-256: 9c52e6e1bca526a49633b9eb703feeb836121b758425cd55aa27d4eb0b859f7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8aadfce43b---dazonosasidilemisop.pdf In PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/43256967527.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/milorelorixilen.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7442cd3e4---mepiliguxenuvirewab.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160742a139a853---wijudojubibi.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/aed5571c817b602068f9bd2129daf4e6/deninuvenonepozufez.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vgt6049bkknfi081e5qiuqr6r6/xoxamekawewawefalase.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/vovibo.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lituv.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b57a72cb6---45833646886.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083361a29563---gumixulujovuwobebuzo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089272995737---bepijizivatanosos.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/varorapoka.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/980bf1051c7b3d215730b873af310480/levutujanifukobuvubodoxo.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759d4153aa5---sizilafifez.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/tumuwi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/76ad5078af622f6f0547c916ba716275/47700690375.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/ziletipusugegebujizi.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/47889342601.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/86082196844.pdfIn PDF document text
    • https://dhesient.com/media/19209557493.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mgej67g9kg8ev2udrtm2bft6s7/1038761252.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c61e9a693---tajomipizivonajuzifede.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/40155858028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=geometry+dash+mod+apk+2.011PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011e75.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E75 18704 bytes
SHA-256: cfb1bebaa56dbf372651f5796151a567536a9c3f1850ddc22657dc5c11820697
font_00_sfnt_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 22232 bytes
SHA-256: 7eb7b6abcda911f69fdbf542b4f3cc265d6e419da9810c8562294a2d5dc7c501
font_01_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 11020 bytes
SHA-256: 414766f7e86d56ef1fbdbf80a68519bdc7018984007a6300b7390521594ba972
font_03_sfnt_off00013c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9A 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_04_sfnt_off0001448c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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