Malicious PDF — malware analysis report

Static analysis result for SHA-256 93dbbdde3a24f835…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 18:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d0985e9eb6812e17c8ca3ae52edf6e9 SHA-1: 2fc1627f58016d680c027b3c6f662fcee900eace SHA-256: 93dbbdde3a24f83596b379078176dab31e7591cc0ba8ac37f809d9e5b6554383
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to deliver a secondary payload. The presence of invoice-related language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://hanasushimenifee.com/uploads/files/selajazobibepuv.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c093d613d6d---foluviganasezawatadaxuro.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/42390eb2b8085ebc625440c2b0b81cd6/41521115959.pdfIn PDF document text
    • http://guowangcable.com/d/files/moxebaxademerez.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079726015a20---mufogiruvulobaxojaxujexix.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/uf4qead710j4iopa1rggkive61/zabegakadat.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/panekirijimaled.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/9549606887.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608758db3a1e8---dusaxog.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/45295ac2e54abde1e9aefb0edd1f3e57/68696045287.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/guwenov.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/rixuduxule.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/28933692666.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/23387070258.pdfIn PDF document text
    • https://samowar.me/upload/file/zogitadesof.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/89477172536.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b926d52f42e---49467750209.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa4a9a54b4c---71505794345.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/43379458900.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e38359dc9793cf6cac86e3f99af1b4f4/46827426573.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/dimibozog.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a50dd09be045f4c22145263b0d319ec1/xerofoderewatoja.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77cbc35d0---nojudogegejudimelanonofe.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b838b35166e---21464041934.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160958406060e3---tiwapunovafavuroxonugu.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/fujuxisaravakap.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/96941490735.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wagenegilinoxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=accounts+receivable+end+to+end+process+pdfPDF 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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 10900 bytes
SHA-256: 70d2cd3c7d100a436d18b7ef196dc9a46b38a2f56aa2c322fedb2f7a35144d54
font_01_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 17664 bytes
SHA-256: 0a9f7aa0a31e4585da7ef76ecfecd3c30a9cc1dc96c9185b9b71c26cb2b4eeda

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