Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a10312c00a543b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 02:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4dd1c7cbcb03a389c6a35fc28ba53e4 SHA-1: 6fee374bae3b3f7c975047d03f20a5180c1a5e56 SHA-256: e7a10312c00a543b0d8f820838b6a278b08c6be4db9284ce1fa79f401b98813e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, indicating a likely phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead the user to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://meyanko.com/userfiles/file///24860374083.pdf In PDF document text
    • https://areicon.com/images/file/sonewawusisujepema.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/fujepujulivepabunuruwigav.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/996459115.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/38156057843.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/21353356893.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/46eb1a583dcc5b46e6b6597ba793b398/44848715598.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8ef6c5809---tewolagoxozerebasekemomi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9837240d56b48b0565127f96678976d2/4304011468.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e151a9499d4---lexeromu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8bf0268abb65a503a03873f00957d70d/xebezalonoxefurevofidef.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d984ce69d1dd62dc9a494cf8f4ab83f2/76173508617.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/rujofikaduvesuw.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/d9ggi9fsfhi3kib97mjr7shd5l/mupapiti.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/ruvasisapuduzog.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/nuweti.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5cad653f---tuwilu.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/kajefiluker.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/fozeridiwol.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/pijoralekexafunuf.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/55591281068.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/52406703540.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/58772009337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=class+3+mathematics+book+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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 17948 bytes
SHA-256: ce34accadb855abca0df21093ac4f7eb0e28a429b88c70779fb4ca0b6395dc55
font_01_sfnt_off00011395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 11116 bytes
SHA-256: f4141547436546bfb25a05243333ef4be32fa43ba2b0c0571ca895fe3ba83a5b
font_02_sfnt_off00012d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1