Malicious PDF — malware analysis report

Static analysis result for SHA-256 633068f25314d8a8…

MALICIOUS

PDF

72.6 KB Created: 2021-07-29 21:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d793ff1e5603f76b063022cb2bae5982 SHA-1: 987fb55a61157914d4195da084b93923ac278374 SHA-256: 633068f25314d8a8bc2a915e969c50e2073f6d2799c7ccea886435f91e0fa123
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://www.alapan.org/fckimages/file/46671312512.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ecgj0dle6hg9oo70pabarubd39/55132721660.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/19290749400.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/napadixekijuniv.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22fabd8865---36331435911.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/66424614556.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/vgs8o08iujel0gmlljlfdmnk2h/jabogeb.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/jcdr43rqbk7n73cq7kg6132kq4/sujodiludososifisa.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210527223709.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1427b27478---wenigegumagimobokip.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/bbfea9f4915e3f2a8f02b25284f532fe/88716024227.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/98692692270.pdfIn PDF document text
    • http://allycatering.com/userfiles/52518875857.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f07080152---28844733443.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7fb77edc02184f9d7821d3bf0f44e8a5/76945661408.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/15323437070.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5fd604a239aeae0dd8ca71463c1261c1/penufuragoge.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gdao96rqh12q3m00k6gpqc6qj1/mumowopawevar.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/28919008579.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/toectr5bopr6k1qlrd13qh0ji4/gukire.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/xivululorekonevege.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f729f86d7330e8e86818d57c52425aef/31173443811.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3735f5e725---98657251333.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dcda881e127---63142834376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+reset+my+freestyle+freedom+litePDF 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_off0000be5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5A 10440 bytes
SHA-256: e2085dc327a4bb85405e8086d9ad258d1448461f190ab2e63160f702527479cb
font_01_sfnt_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 15160 bytes
SHA-256: 22ca67b7735f8189d1722fd133f06bb3629734d80ba6dd1a3e7e4007fd2f8e0d