Malicious PDF — malware analysis report

Static analysis result for SHA-256 471ea310e57a0063…

MALICIOUS

PDF

95.0 KB Created: 2021-09-02 19:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 757ed035badb7d7ab126a2e15bbed30d SHA-1: d1f34158cfaaf226ea138a12ea594b8892360b4c SHA-256: 471ea310e57a006314b2db85234f0baf990c6e4f24446321cc8bec3b593b36bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://krisoc.ru/uplcv?utm_term=lokomotywa+tuwima+pdf PDF link annotation
    • http://sys-svinding.dk/userfiles/file/67984253102.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/wurokuvugerilu.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/98662702010.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/mutowufutoleta.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a962926c33---faludujegefowalanigosufu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/nubami.pdfIn PDF document text
    • http://dimexautomarket.sk/ckfinder/userfiles/files/7273647386.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/887cee1f4e7687fcb2bcc0df87d54171/bedawunezenakuroxefivilem.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b0cd04e17ef15b1a860cd7599d89c1f2/39291485328.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/173ab40ec84403bd0b3b30e76debf4ba/fopivotejebawonag.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/bakubolumofagoxaweximedip.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02988be0c4---18695482963.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/92874573401.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210713054250.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ac442caf---nofenug.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4176e74e4---rajiluxivakevufigev.pdfIn PDF document text
    • https://x-software.cz/data/file/32445986321.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/58a32f853958ea9a69b61e8fbe0f5a31/temiridid.pdfIn PDF document text
    • http://atya.eu/files/file/59819561305.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/runamavevixesu.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/80707426484.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/sogopasemomuwazubujepud.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/eb9fc22fc714221c6360acce0d872713/xugiwoxituno.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/tizavopazewavaraneva.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 19136 bytes
SHA-256: 1829fd6ed1db2bf741a3749076e461135ab83620871c49bbc434f81931324c53
font_01_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 10456 bytes
SHA-256: d2e24b0e7fae548b9315432a88af8bee97dd84268da07cb39f10c307cb1a50e6
font_02_sfnt_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000155c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C5 16444 bytes
SHA-256: 99c70415a40a7c249ef1c48b808d4011d2e2edc514ce2d2268b78a64c4bc5363

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