Malicious PDF — malware analysis report

Static analysis result for SHA-256 047abef8a89f2afa…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 02:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1c2caf799ba6a54bc58a61b4310550bc SHA-1: 95a9082ecfdb5a13a8673ba19a1a4bff1ee4c714 SHA-256: 047abef8a89f2afa96c3dd8c9f3f327a622a63816d6fe314d096126c4820ab39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to websites that appear to be compromised CMS platforms, specifically WordPress and others. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised CMS upload storage. This suggests the PDF is designed to redirect users to potentially malicious sites, likely for phishing or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=club+multiple+pdfs+into+one PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fe4ca599f7f51005394a3bce226cd8c/rikulubazazorojo.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/binajakexedanudujovej.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607076dbcda10---66958535946.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/wobuxavukap.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fbd30b6125eca4757584c365279060de/xekebuwufogiseva.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160724cf0809c8---61142017526.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/2u667kgmusomdf3cmrg5a8g775/75889842339.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a576e68b4b9---53174402939.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/ef3e3a3234dddf85b1e1cf6ceb4b10e6/71141445912.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/zajural.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6ac8891c1---tirisujapokokajilidigu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/497431115.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/57140267213.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/sebipupuvofasi.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/botunotivekiviruzula.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//robobexoj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96576924b5ad171b061aecf2e150ef9c/larimit.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8d31bfa151154d604ed8863ed5211a27/82919742642.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c3346eae02b---mozakugivabekukevezotita.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/56590037412.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ok9evtpnp4a9ru257rps09bq31/tajafomivironoseneragigin.pdfIn PDF document text
    • http://industrialdevices.in/uploads/riwifiziketamopebizawu.pdfIn PDF document text
    • http://ahchala.com/img/file/92037820232.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_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 18016 bytes
SHA-256: 7b173c519168ed8bda859164891756733ce579b57c78353a4f46cadb29d367fb
font_01_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 10668 bytes
SHA-256: 34b9d47eebe5337547904dadbba112060cef2a389a94344d5903a3a408babd67

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