Malicious PDF — malware analysis report

Static analysis result for SHA-256 26670fdbb8c88a12…

MALICIOUS

PDF

88.2 KB Created: 2021-07-01 13:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e36dc76f4d12ebfea07ac76b15490ff3 SHA-1: 1ea6d32661f7067e800f1a9bef84ba2e6ca3167c SHA-256: 26670fdbb8c88a12a1fa6eebf67f2dc639b5e049cdd1cb9aeab86966aa0d2211
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and potentially disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6b81b0fec3993d5de161a6fa2eed4729/47075305065.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/97m517d6mu7tdcgt17bin55cnl/5318763612.pdf
    • http://ciaooo.ru/uploades/userfiles/file/54832765186.pdf
    • https://pet-fashion.ro/mm/file/86361824988.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/xomazugi.pdf
    • http://pivotal-technologies.com/userfiles/file/33881291155.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b054f6dbc4a---roxonaxuloxetobudosik.pdf
    • http://dgjst.com/upfile/file/foveviwuxuvukixa.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/b330e9e4868e4f8719f68580587126d0/zadekusexudinibeparotare.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7kgssdg26iivaf1vc3atq9u3s5/79127740803.pdf
    • https://leavingcare3plus.ch/userfiles/files/83494157208.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b738989a3bd0305768dadcb303b7517a/lirufana.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608713d7666b2---mipofasuwupenobabaxogi.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2617cacd---sofogikifetapa.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6f1e4f81---gikefozikutimabejenufa.pdf
    • http://lacasedescaraibes.fr/file/losededubopunodafavu.pdf
    • http://selfmadefilms.nl/userfiles/files/45896889454.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/122fcaa19189beb7a1fecdcdd3e54450/51051165202.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3d893705---82222899297.pdf
    • https://clubesolbra.com/uploads/files/54273626550.pdf
    • http://surtek.biz/image/files/20150115_235824.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160912be1ebe6e---nozevakudaxarukigekugi.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/92fd27e797ef2a0f2bb33c1b6cea6526/6191252569.pdf
    • http://schodylux.pl/userfiles/file/milil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kcet+2011+question+paper+with+solutions
    • 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_off0000eebd.bin
58d1c922e7faaaed7ccaff806541ae0759daa27d5953c51e4ee43698413fae71
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 19076 bytes
font_01_sfnt_off00011f85.bin
8ee077751bb4bf97c94a62a952af8c572948405e0a9b50342824e221c32195cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 11088 bytes
font_02_sfnt_off0001397a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 16792 bytes