Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e62962440d76ad…

MALICIOUS

PDF

86.7 KB Created: 2021-07-18 16:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc9e809a5d6670a5a996263d01697981 SHA-1: b4cc257036753b49bb48a49bee49950ab57a9733 SHA-256: f5e62962440d76ad3e038d30e70b02d8c8b7d38c3feb0483eca5a6adf4439a97
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of external URIs and link farm characteristics suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://geologocarmignani.com/userfiles/files/21004652946.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a78d0fc6c2d---mujudalakovabojebeso.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/846e6904d5f9fd95cada89279917b3f8/debafedisud.pdfIn PDF document text
    • http://evola.it/userfiles/files/90079792489.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/89191919384.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2ug014fln6ae0b0786ru3vksg5/borawolojubaxobokowabosos.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/361689376.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a365a7a8e---22053127309.pdfIn PDF document text
    • https://jagominum.com/contents//files/78131554903.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabb8a1d78---81717857188.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gasajulewoguni.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0a0e10b47ca16ee930653f33b04d193e/bajuravawego.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd75566adeb---nuzezudawiminexu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932e272d092---fizanubibemisu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160913cabbe570---fatizenamelodokoxikaxux.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6778696a1---59400847780.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dd008150078cecc920c863e7e7557f9b/morokibunujekojoga.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/c959e82806074e2797a1fd5224e3238a/53428364930.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qnj9tc45gg2muggrgirbsva177/47204620788.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/30920965000.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/99205897365.pdfIn PDF document text
    • http://mosjob.ru/images/file/28805215559.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rokabifexubexuj.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089e786d2fda---luzogelutolidulumesof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hangover+tamil+torrentPDF link annotation
    • 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_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 17820 bytes
SHA-256: eb60fe06cf06cb03d289c4cf430a72d585e8759027b6e18c564970c899aefa3b
font_01_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 10340 bytes
SHA-256: fb98c33fc21126fe22893a5732bb5837d42f30e3b5aa42104b46476e0f73cd36
font_02_sfnt_off000135ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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