Malicious PDF — malware analysis report

Static analysis result for SHA-256 9867d85d28e95c02…

MALICIOUS

PDF

91.3 KB Created: 2021-07-16 01:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6e912144a7c3a9892a9c3f4a203b823a SHA-1: 3c9e5f17c09ed4c53cbdaf697ce89e645a6b9849 SHA-256: 9867d85d28e95c0274bea9089255ee9bba05fc83be562238f4ca053328dc3623
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://electrogalicia.com/electrogalicia/recursos/archivos/bajazedisoxezogokopevine.pdf In PDF document text
    • http://megat.pl/uploaded/fck_files/file/21851205074.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160837a837d346---mibiwura.pdfIn PDF document text
    • http://sns.hu/_user/file/50708337263.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8787ddbe83---xidezunezuwata.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/ponofegazor.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/c3498e138e7ebc9040094d9be30059ef/14035627716.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/127090684660c9baf0d4b0b.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/bda2f4f35a3a8dc2b10ce5e784b5979e/wefavemagudepepoxi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36bbe429c---koforu.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/40072544292.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fhbv5h1vlo9a7jpc11upvlua1f/giribineriwemupuzikavuduz.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/mixuv.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6b6d9551e9f9e797062b50e10295ea3d/91394309372.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9d52daa3203ea7b363188c60fc4e78b4/69538102615.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/302f0c0e26bbef665dbf086273166403/xadepefozadigigumo.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a358ec0195a9cb665d25e20629310549/xumawekijapubixe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/0ous6q2tlfp7mlh4dfuqb64fa6/81236679953.pdfIn PDF document text
    • http://allycatering.com/userfiles/rizovupapupexulak.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/vitipokazejujomajoxok.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f158f621b483a9782079792833bb45c1/xodufavexabagid.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8rqtp78pel9e804ltnrrva99e1/36718153591.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a748da3928c---63994277172.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/salededumijiwuv.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/88250966652.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1c3a7f5ca---47173408768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=why+is+uranus+blue+green+in+colorPDF link annotation
    • https://mediaget.com/userfiles/files/beruvalofu.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_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 17232 bytes
SHA-256: 819c1e959149b69974d147129b9b2df62f4e12eb163ccf8c76ed4fc6d343a28a
font_01_sfnt_off00012ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 10756 bytes
SHA-256: 4b2637850002a23f75828867ae2841be8ac97e5e78dfda0703a92cb1620ab973
font_02_sfnt_off00014795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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