Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e8e7bf933a0875…

MALICIOUS

PDF

86.1 KB Created: 2021-09-11 14:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: f04709553a612b3a9d60f4ee23326a51 SHA-1: 6408f31b538c6618fd92b2529bbd3b3692d70e0a SHA-256: a4e8e7bf933a0875330710e78c163db8e31088fd34be392a90410f3bd9c6bf37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://nomylo.ru/uplcv?utm_term=animal+crossing+wild+world+nintendo+ds+rom PDF link annotation
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1853fb3935f673381e7b96625a40b445/93556540653.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/kibipajuguv.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/57852413513.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/81658866507.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/65708083354.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/xerunowowosasosojulorixo.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210906011946.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///fowadosenerufuniluzul.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/jekufefixazaridowep.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/21636644845.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/77311671847.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/344a9a111cd0f3e03ed4fe15b95d170d/67048188522.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd43872022---69166034830.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/gomumenolijojizi.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/komifigosoluwebato.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/foperezimoxut.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c14e0568b2---76595051707.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/sobimakefolibenap.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/bb12b99283627e49245aa556dfd70aa3/98334995250.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/21610601466.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/91269649798.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jcqpejgntt4t7iub2l0t83frt0/sunobezajokuferi.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/tubisotexokemokutesutiw.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/lagobagejolemanura.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_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 19200 bytes
SHA-256: a947128ffc3a97e54c4f1e8597d799b14da04750d6bfd3f7f4d3a32624dfc011
font_01_sfnt_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A1 10780 bytes
SHA-256: 0fea5326c4e0c6f803e98e23ae343183a65308a98d8f46ad0b29652bb944cc8c

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