Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe7889aef1993fe…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 22:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee447cd94ffd59dafc4d167bd148d1d7 SHA-1: 8081c14c61a4ee0820e79b4bee175f9722e94712 SHA-256: fbe7889aef1993fe24993c3bd715b99267871b326333c0f2e326ff8061a09f94
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. These URLs are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fffc87abbb5---fijavewasod.pdf In PDF document text
    • http://trips-in.com/ckupload/files/wedixabijajoj.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/81431984246.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/38954371656.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/91647681836.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8819d31717839b2c5ba39fcecc233539/20637310087.pdfIn PDF document text
    • https://aedwea.com/upload/foto/natirokurevemefo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//54365400999.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a8b69bb2---zalogulodomatu.pdfIn PDF document text
    • https://argumentua.com/i/file/padizagiligadogajabu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22562cca5---lenilefixilegiferowomif.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625908419.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/14329990846.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/82792899970.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/zezefobawawejamelavumerik.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607266f26e284---vazerejiwozawaxovijifo.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955b7e9d2ca---puxatefuperosevasu.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/64332539414.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/71268446877.pdfIn PDF document text
    • http://jump360.co/upload/files/20210809192049.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b71ed15b1b89bb3d899eb9e553b06cb6/16227524425.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/11852893165.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb82dab5b4e---noxobu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1fb199565bb5cd099c99ee9e12b9e772/ziseju.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d03045a2d---nunizesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=line+plot+graph+worksheets+for+4th+gradePDF 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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 18080 bytes
SHA-256: 59a9d725e116e1b6794bf8b5794f5ea50d5d5a324a1d5bef67b12ca3397f3a7d
font_02_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 10992 bytes
SHA-256: 9a0e15f9568bc46bdaddbb24aed4c07a1cd99888a689924e66ae335e4b94bd13