Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5b4d1557a6db16…

MALICIOUS

PDF

90.1 KB Created: 2021-06-30 11:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e3ae3f2f436927fff20839e3411f9ed SHA-1: a5bf5879c7e7fcc3851fa3bd3a6b4008da353b28 SHA-256: 2b5b4d1557a6db16c0978364ed6875847092cbde607528a880b761638e09f4a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates an attempt to redirect users to malicious content hosted on these compromised 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 https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b4361a45371---zovuwomegoripelukoxadun.pdf In PDF document text
    • http://mesterek.net/tmp/46889159747.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c87db3f429---tigalevogosopasafinukixux.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/39708254795.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b92bcadd7---domobizoborox.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075a12ce696a---7013037676.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64c0d23cf---jerijaxilisikarug.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kazexu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b75fe6eb5---lasuxurigebanazixetemewim.pdfIn PDF document text
    • https://kalewebsatis.com/calisma2/files/uploads/72205620990.pdfIn PDF document text
    • http://aroma--style.net/files/files/36745054666.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/11246189180.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vuh43bmn7b9rgchk1ai0btk5ek/12460940261.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70b0ae0e4d---61830419347.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/84230869550.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e88ac9b5---94036022546.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/sepebutajomiz.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8vn5fohrhs9p0m1s99t3ddmcag/laxaravajelo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6uhvedukpgrdu9joc8u56n8ibj/luguzipujirosot.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/demumedolusibifesomope.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/18674624731.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/132bfb56064359c1bac82d9fb182b3f5/55657066521.pdfIn PDF document text
    • http://4bx.pl/public/file/nisanitepafomifivoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=marion+county+lands+available+for+taxesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 16748 bytes
SHA-256: 42233db1ec3765439b24c10821acfabf7a348d1b41ad8dc8909edc606d3760d9
font_02_sfnt_off0001419c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419C 10984 bytes
SHA-256: 973f5abf91056015e36df6087dacf1b64969df6552ebfc445e07617dc2e3df04

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