Malicious PDF — malware analysis report

Static analysis result for SHA-256 94989217e355cdd1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 06:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27b31a13478d078b2f3dc79fe28c7d2b SHA-1: 32ff3c4de3e760bd0bb68cceb4d73b78b76aa407 SHA-256: 94989217e355cdd1d5cc5afcd7b439fe7790f881fda93795561bf773c32388e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm or phishing lure. The PDF structure and embedded content are heavily obfuscated, but the presence of multiple external links points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/dc6f46cc7e25707580729eb490010976/wijepakap.pdf
    • http://adamlegal.com/userfiles/file/xaturubuvogidox.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/84b7ca7233c470121bb986e3cd129238/8268002691.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/68217769223.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/10aa60a333263be8151d85cbcaa1ce00/76873615981.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/tawikesibil.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/metolebovarok.pdf
    • https://schmitz.cz/res/file/guvibozu.pdf
    • http://safaraval.com/basefile/safaravalcom/files/21559520617.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9f6f61f27676e7068e8a7010ba0dea0d/wugopixexobewidisefe.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/tanexupifofawujuri.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ehod6j64nu95003u2h6heqkg21/tonuwugeravogalut.pdf
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/70471112686.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6565ce021---78365524925.pdf
    • http://polins.org/public/userfiles/file/80373251158.pdf
    • http://www.kickcommerce.com/userfiles/file/90068145943.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e926f18eecc---12073975885.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bde8621f5---16592262626.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0c9ecf73---89375572969.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afeebe1ab62---88536676757.pdf
    • https://veterinarycarefoundation.org/userfiles/file/bidozojukizediw.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a760daeea6d---sapetatutubeta.pdf
    • http://kcntanduc.vn/img_duhoc/files/bagewodugelejap.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6fb238a88fbb200f7e1d50b573368d24/zakof.pdf
    • http://areaengineeringsrl.eu/userfiles/files/24685708707.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=driving+directions+to+gatlinburg+tennessee
    • 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_off0000e02c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16792 bytes
font_01_sfnt_off0000f83e.bin
e0a36cf95d1f331319f88862ba41344a286aeb9712cb4104e6d2dca670a44af5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 18472 bytes
font_02_sfnt_off000127d8.bin
59d42ea279600b876fce84f0b2c6e1ad678d4455fbfb5df216e793ef2d4a75c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D8 10852 bytes