Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf43b353e377df96…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 01:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 84043a0c770e2dc64e54b3a356b63177 SHA-1: 5dc983facef967eec530dc4dace9b379c5b617ee SHA-256: bf43b353e377df96fe0c7c8bf18cfbab8d82f99b6d2b275a9484cc41341440c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are hosted on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of external URI links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=how+to+install+ota+update+manually PDF link annotation
    • http://simsvizag.com/admin/uploadedfiles/file///bilukelopejizesajazul.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/surip.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914143318.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/22126272909.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/tilegukejofamifurolizaso.pdfIn PDF document text
    • https://kokomanis.com/contents/files/vanar.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/51503446998.pdfIn PDF document text
    • https://hoavily.com/uploads/files/49902963630.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/zutibuzizoxud.pdfIn PDF document text
    • https://plasy.com/uploads/file/30498976172.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403c7746da3---roverinemulozilepevuxanip.pdfIn PDF document text
    • http://kodemari.info/data/files/72176278443.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/h7hijqqkcj6vi47n3e4fqnptjo/35746819184.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70ba1995a---44431458341.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/saguwabegi.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/venam.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/jomanepijo.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gofuzebuburivesi.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sutixo.pdfIn PDF document text
    • http://turnyras.lt/Files/file/82239171992.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/gugazumupufokirisijun.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/8568681806.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301242c7611---wipurerukemamemidelebifol.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/35495673048.pdfIn PDF document text
    • 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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10744 bytes
SHA-256: 1548d02737b997612fe7c31814b4e89003381e5aa69cc6030622ca39c4a4d6ef
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 18032 bytes
SHA-256: 455dc40db3e54da1998e04cf9514cb460cf8d62bd3671c07562127ffc7932017

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