Malicious PDF — malware analysis report

Static analysis result for SHA-256 087f7e346dbd0d34…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 02:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de5cd078cb486d344134841f313cf0c4 SHA-1: d6b07bafbc5abdac4a30393cfa5a47ecdcd6efe1 SHA-256: 087f7e346dbd0d3468ec01560116b633472dc8ab2fbe86879d51bf82ab334420
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports the malicious intent, likely to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=rupaul+drag+race+all+stars+5+online PDF link annotation
    • https://vinacomvietnam.vn/uploads/news_file/19442996409.pdfIn PDF document text
    • https://unosms.us/userfiles/file/69982925718.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/nigipijovukudedokegekaj.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///kiviviwifi.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/54691028251.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc12eb60bb---suwulixukigox.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/32841269865.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5f0030ea6535b6377cc01597bc7a2b82/70947878654.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/55610802967.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/dijuvanilixifedidilanugob.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/negadutilizisuguwo.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/xagulezuvasezuga.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/1919958974.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142e25da9c73---kamezalulesuladefafofakif.pdfIn PDF document text
    • https://polandpools.com/contents/files/saxovizigobinegiwu.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/83221254520.pdfIn PDF document text
    • http://ubest.ru/images/file/pimuvopusudiruwabugebi.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/xopozuxeposutunute.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/61503203998.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/5152486675.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/80451923363.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-14/20210914145211165997.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/59633662756.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/77982444055.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/rideminosubidebobisu.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_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 17820 bytes
SHA-256: ce20c1cfb4f7d7c317581c64bca7e93da489884d01f89f892534747fb80704c4
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10968 bytes
SHA-256: d4cea44db1071f79f5ec5f2a38ab1a4427ed52eea32496cd8ab3a3734177413c
font_02_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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