Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe74eb781c89241f…

MALICIOUS

PDF

88.8 KB Created: 2021-08-25 14:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00440a5e4a5f055f7d119fd5e00889c7 SHA-1: 05a8adb280607b90151e2857fa20c3c7410ef4cc SHA-256: fe74eb781c89241fb2f216d69632d7bd1d57ef74ef276f6baf67812225d577fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to obfuscate the malicious links or initiate further malicious actions, while the link farm on compromised hosts is a common tactic for distributing malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/bc907ce3dcfff64a9badc2bdcfb2a627/61540568287.pdf In PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/rokela.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tvs9u2rotcfuhi6ugk983a56a0/situxexuwu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gtq6l3gpe00oui1gue5ghe128o/zaxuzulosuzasis.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703f31dcf30---71347822420.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd523d52f---26496686330.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/53889692066.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7b1da299507ba6e5c0a4083d05a7455d/40265160295.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609a442beb232---69050027294.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///85624800637.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224d944dfc---fomavadigugo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e7ffb72e2---nabogajafut.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e41eef25aa9e53dd0980acba0b191988/36851138762.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c8b20f19c9bb0b9639aa8c2a26ff0b1b/tujekolajarerizoraxar.pdfIn PDF document text
    • https://mkart.it/uploads/file/padajepaketatovumuw.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/48700537427.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/42517360923.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6f3bfc4a39ea67fe7e086adbe2372b4c/sofosapawonuzer.pdfIn PDF document text
    • http://18554080.com/userfiles/file/sebikawuluduniravifok.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5521171abbe4dfc8ff4314219e9c263b/jatog.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/depozanipilufoxebekenisa.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/davutilo.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/8ta2k293vnnril6p99c152oog5/numozoboruwaf.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5ec8f3f4---tujulazusobufasalasiru.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c4e0f82fe9ad9498f3748a4312e589f9/tufaxajuro.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/18900142664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+draw+black+spiderman+easyPDF 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_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 11100 bytes
SHA-256: cc3517fac3ec29bc31d5fa1af574c7cdba339f64ecac891bb261a23e7ac62f23
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 16500 bytes
SHA-256: 4a729702f28646d2213bcd84a75a3961d0a7d9e6d216e8db65f1c3363d6f3a76

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