Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bd99f4711d3eda…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 16:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2547ecb27a6aac4938278556fa059d03 SHA-1: e640b56b8598614e4ad8a31d0b4f030d1d97e244 SHA-256: 63bd99f4711d3edafdfe0f98b5d1b5776189edd14e0acdb541baa28a67ed40e1
156 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. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed here, further supports the potential for malicious activity such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f3155941720---38315661900.pdf In PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisujup.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/nusagi.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/judugusopixitowotu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fa68e7c5cfcaaa26094b93b8e5028fad/69152554237.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/luxopijobikatizudovopu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/69879befc6c39f7601625e8ea43dcaba/xalewomodudenipedadoga.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/25259816847.pdfIn PDF document text
    • http://termocity.by/pics/files/desazixatukozosawuxo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e083ae05cd63094ea4efde548cc3b31b/12328981872.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00d6b88caf---10603251484.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/4f1290fd64a4d10c7989af4d9f6bb0f7/pipitaxadaxunasukumonef.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/furumodixekemepixavetusej.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/hbmsgbc2stetroer38snkkqnii/zukezejukokide.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/marupezapiwix.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8928eb11---nifozukalefegunekotovora.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796e968b78---fixasutafanexalef.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8e3aac941e9f190ddfaec101f9349cd8/vasusefavojudasokebudaso.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/zekabotinonixakuzijemigu.pdfIn PDF document text
    • http://dakmet.pl/upload/87946711752.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/26240146273.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/26826596419.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/vikenivumeko.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7df0fa8dcf09402e1a32d9191a6e7bef/zekeguxalamuzowajine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=multiplying+fractions+worksheets+grade+5PDF 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_off0000bbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAF 17196 bytes
SHA-256: a1425716b360feca2f5bb5e6e754402f2102f42c308a60a8f8700ab6270be25d
font_01_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 11416 bytes
SHA-256: 2d91cd28f4a7770ae83afa7aa1e92095b5b80475c70752941f3b65aa3bc7b3c8