Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ba2864ae03f353…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 19:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4801630e36e059ad069101684fc014e SHA-1: 92c7effcdc824fc99d992eec378be575ec41d5d5 SHA-256: 62ba2864ae03f3534388760ce3e2a4b70ac76915359e819f1b652e0fea8db9cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a link farm strategy, hosting numerous links on compromised WordPress sites, likely to obscure the true destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's intent is to trick the user into downloading a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c921f28fa6a---33544543735.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753f5b4b844---jolitexerotaveda.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/togulosokanotupoj.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/dewenewuxelapide.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/38172398604.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/74611226959.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/5df91f893ed047d5e34dcf8acaafed42/17015086058.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poneziperomopokunujogo.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/44493280936.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec88ef05a---58084343675.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/23440224949.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/segazidowelatamesituvuvog.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/redoxiwujisomovamepetaz.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/pufajuwamep.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c183ad20926---45929758542.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16128134fa7729---37534179960.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cfaac3d447779b9a17f816603fe0c1dd/42926191563.pdfIn PDF document text
    • https://braus.uz/images/shared/file/71093166851.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec901ac912---29709999144.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/iaoa68dchac0o4ieim9ptg3607/91952264846.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161157cf740e3d---lekamimepuzosofobiwir.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/xuzafafixunuramoxixazu.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/muwolaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tamil+latest+melody+mp3+songs+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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 10972 bytes
SHA-256: 9d5790c25e2d1aae0a87b7a71e6e6692e39ebb7daa87b9bccca2be447ddcb406
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 17680 bytes
SHA-256: 6447a15ab02d80e4d28bbd61045f87967007de1f2aa165cb49f39ea9b1c4eb71
font_02_sfnt_off00012b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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