Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb56dcdf92e8419b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 12:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c6bcae4c83a99dcccf9a2a79fcafac09 SHA-1: fe29f35925bd01b7f6761ce224e6cb3c247ecb29 SHA-256: bb56dcdf92e8419bfce2104fdbc486e5461ec76f5cb3432124df1590630a259b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=harry+potter+illustrated+edition+epub PDF link annotation
    • http://indianspringhomes.com/userfiles/files/lugejafigosexefewegu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aea571436---7731519671.pdfIn PDF document text
    • http://becucci.it/userfiles/files/xorizatoj.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/detofujebijeluno.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d5e1a43b9---ditepobi.pdfIn PDF document text
    • https://toocapen.com/files/kifazusukivuran.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/73627313317.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/73835126839.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/812dfe1b6be80d1863e6c424672f0ebb/72223429241.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/gurivutunasilad.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/67028912923.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/sexoxekerabuforam.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/rinirumewadejowupeg.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/256047f2b0b1e81284c81e2322892043/zajubabolikebefatozel.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e835cc61c5---meduku.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/2780294725.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/80277433490.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/29197249323.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1432373401613e46732e9c7.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/760026893.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/relademav.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614acd9da9d9f---lixirijemirifupubufixewas.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/69267651831.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135acfc523fb---xisaxebederipunuvage.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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 17688 bytes
SHA-256: 48736c4a93b89eb95a9cc85956dadcc3466036b381203cdd270a4191f2c6122a
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 10728 bytes
SHA-256: 2a50ccd12863b058a36311392cd99d03d0117d4a3b684f11de7fb6052a7353fe

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