Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57e5cd0331b68c8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 02:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d74226b6276a965b4df3b2448beb6e7 SHA-1: 3171ed69489336ffb22662ee0667d49c0de1952d SHA-256: b57e5cd0331b68c82c91093830b401cdfa1583b2378aa2236c723568113101e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The primary function appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=cid+old+movie+songs PDF link annotation
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/57015516921.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/powupitogulefegap.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/22049935882.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/nokunakadej.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/36834653848.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/busupuputejamuwewa.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/fejisifoxolobokob.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/351df24e44e00a24cd37d96da63cc21a/guwamebizegirafufubolira.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/45041739061.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/59ed84e83953f71355aa39d001c6190c/9970401592.pdfIn PDF document text
    • https://papiratisk.cz/soubory/ruwunimatagiwima.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/27637471586.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/24565201867.pdfIn PDF document text
    • https://avflash.nl/upload/files/23617058579.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56d9e5673---79131859811.pdfIn PDF document text
    • http://cloverdiamond.com/file/67326814426.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/senabimiratawaf.pdfIn PDF document text
    • http://poultech.net/d/files/gunedajidazagidaberezaw.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mulofive.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/75413859580.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/ximugulixurumitolivinusi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad2d251ab---lorefuxotamutivini.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/kiseripep.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210903163064609619.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/73586972279.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/redinemu.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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 17872 bytes
SHA-256: 6b28fd189f2149dd536bcd8a0a062842a3f036556b60fd1d02848bcc64dbf2cf
font_01_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 10328 bytes
SHA-256: 86103c49e95459eece457a79fcd0019d09f3fcddf69273f800f05e4bce004d45

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