Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab60bc2240b5a12d…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 19:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb0b57e6d9485052a6e92390c1a1f03c SHA-1: 1df331236f5b7c327397a43605cc9e750b43f9bc SHA-256: ab60bc2240b5a12daa26ac65a3b80b5ba1f74e066d4428d81053bcf4dddd3519
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings point to a link farm designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://turnyras.lt/Files/file/jadinelopibim.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b62d0cb63f1---58156087444.pdf
    • https://bodymason.com/user_uploads/files/josaximojulixaxi.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d1c7a471---53825577999.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67ef20ccc---97674654427.pdf
    • https://llibreriaha.com/img/events/file/nobuviratoxe.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef8f5449e---73701763418.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2avcrd03rorba8kcvanskm5hqn/keperu.pdf
    • http://brandnewgoods.net/userfiles/file/66463610423.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4c5fffca7cad5fc2e9a61c0140841977/73790032080.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf44528c3---juwedofugapudugigedipoj.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/heroird4bnlmj72sp6bdl3agc0/forofeni.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/523b0c01ed6492bbb902903eb13159b6/53871728264.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051520538_1025438064.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/814149f168f5de298066e233f7bed9a9/sejex.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/514655dcd62a16e09157d6eacd723c26/70021753559.pdf
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidikumudixe.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077c617c13fe---fugodufegudebunavulolikux.pdf
    • http://podlahypilat.cz/admin/file/89636952771.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/k8pa59dccp763cqfgrv8fd51qc/fafixupuzoruwewi.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/9k69alubt59ncb7h06rjop65he/33886759132.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160754bf47e749---razimikunusatajixowoku.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bc32cf6d711cdee070475e34ae5ad5fe/zoxeju.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfca9ce0a7---budewuxabubakibezol.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b633efc9996abf77244bb175ea9377f9/45320871420.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=greek+gods+names+that+start+with+a
    • 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_off0000ef93.bin
9415d36dfc3e61e3954202ab7493889287499c7e8d4ef496255bf42f0954abb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10864 bytes
font_01_sfnt_off0001085d.bin
75ff023ba6cfb4fa4a26947ab28a53e7b44ace16b56e80708a8d664a1c77426b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 17020 bytes
font_02_sfnt_off000134b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 16792 bytes