Malicious PDF — malware analysis report

Static analysis result for SHA-256 315bb63a01b5c982…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 06:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09b22b0ccbc019284d2d1c7c7e4a6d27 SHA-1: e5ea41d95eb056acd7da69bc2c72f2fec1bc7fd0 SHA-256: 315bb63a01b5c982817bf5a13fca65849f909cd5726341ae8ca1e83173aec34b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=apps+for+recording+music+on+android PDF link annotation
    • http://coeb.eu/userfiles/files/tekezoj.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614053d4b05d0---gizopaxulalamixurikipim.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a79bf7c3---fonifopox.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/bapogewogufunufunev.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161384f51c1d15---rifuginaziv.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/zapitemulumerusazu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/netikapumokixadatages.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/woxemewuvomonagowoja.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/mojaxifojuw.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/wimibomadugixodud.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/91371585225.pdfIn PDF document text
    • http://metall-press.ru/files/sefapekeladexokubed.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404ac48143e---fulapatixo.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/dimuna.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9143ccf---10066018874.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/34142434540.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/sikulewav.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/vafabuwuxarugoje.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/55914595899.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/19496610356.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/kazabezurokekojadupifawas.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5fec4d951---gebemo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac7d1b038---42094952975.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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10900 bytes
SHA-256: f899fb64d6aa93d10f1248b6780a834a4236b4d15b4795655420eae476259f20
font_02_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 16656 bytes
SHA-256: 1af8b824fc62afa3efef8352cef02c0743e5cbbdae0e443ebfdb76a9b497e55d

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