Malicious PDF — malware analysis report

Static analysis result for SHA-256 3518416e40e69d4a…

MALICIOUS

PDF

74.1 KB Created: 2021-10-02 19:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04fa517a36319b899a6316bb897490a2 SHA-1: 9563a76803692385076dafd039d8eb03930d48ed SHA-256: 3518416e40e69d4a8f23b98bcd40b10a736f14fbb049910ff808673fe9136d61
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several heuristics indicate these links are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=convert+to+numeric+php PDF link annotation
    • http://355353.ru/userfiles/file/69943441903.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/79251524411.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/68896567799.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f355e78f7c---13724764358.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/19525487138.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161496686e13a7---zubepinodu.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/91946001599.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/80183488085.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/kobivuwa.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/bavejibatabamaborinif.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/47981368225.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/59684834539.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/83285516048.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/notufutisazuwuvade.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a3ef98e364974ac8fef0844c9912f2e2/19315735832.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/nexajunisolituralugetogu.pdfIn PDF document text
    • https://zzhqhi.com/d/files/jowobixol.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/44211060305.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/labuje.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/35383386979.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/52275206802.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///foxuduxul.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e16f2865633a5840085aa7a74d69db54/55066220769.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/pumirotatolawurobilekude.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_off0000b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DC 20748 bytes
SHA-256: a5696d42c09997eb05d7000bd67ec06985e0afb521fc99dc5430e17e03f2b9ec
font_01_sfnt_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 10460 bytes
SHA-256: 9b914cda2db8d61ef26ce4cbdb2c055b6dd5c4594d0dbff98c2f70f065bffb46
font_02_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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