Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88ef2fa5eb8f700…

MALICIOUS

PDF

117.9 KB Created: 2021-07-15 18:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d4fb18c1364867492e57c4db2997414 SHA-1: 1d3c49dfc8fb922ac4b6ef49909e15e6986c7c8e SHA-256: c88ef2fa5eb8f700f293dc74744a07ac5fcdbde372fffcb214fae1007bdf2473
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad281036e1---80743691688.pdf
    • https://digireg.li/upload/54618499232.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/131f00c776c4667ccc329bd5320ce9b3/98363887982.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fc682e9b0ef7193762f3827bddeace24/jibapijizif.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d1df5be62---xifusowu.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ffd94567---55273698738.pdf
    • http://resetimpianti.it/reset/public/file/silexagadakapa.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a5f63e97---wekatigobewepori.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2da387944efef09dc987deb5fe5ebddf/39670586313.pdf
    • http://teknis.it/userfiles/files/68715715274.pdf
    • http://busankid.com/webfiles/board/file///fabexinejevadazimogu.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/xopodelekoxugadakovorijo.pdf
    • http://sacoorhealth.pt/site/upload/file/87077011026.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c244b38eb---bosupijerunatuve.pdf
    • http://frezerovka.by/images/fxeditor/file/favetuviduposolidobo.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde7e25db4---dofamubatagosetugamaben.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vrk2stq4d9vl6uvso7ikk6vvlv/xutoludanala.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a671535a3a5eff62fce65856a95871d7/54758440550.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b677962d1b8---62079210870.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1af0ea5c57---ledasirap.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037a4557aa---25948944466.pdf
    • https://faktxeber.com/resimler/files/momov.pdf
    • https://almuhja.net/ckfinder/userfiles/files/4624347054.pdf
    • http://progfin.pl/userfiles/file/12541878846.pdf
    • http://matras-devison.com/upload/file/75421429172.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+the+bible+say+about+cheating+and+forgiveness
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C04 16792 bytes
font_01_sfnt_off00018416.bin
63e8f108cc5ecf82229dea1e3f72729c2b904cd0d507dcb3f13b0f3a8619c34e
pdf-font-stream PDF embedded font (sfnt) at offset 0x18416 17076 bytes
font_02_sfnt_off0001b014.bin
815224e64d8f6001f16672d060eb2b70306aa91253be275dc50030d110ff3315
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B014 11168 bytes