Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a79e1b3d2f93698…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 06:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e0f04a11048eec15835801a0271a2ab SHA-1: 6e65eb7fbb1d8e4c8ed44bd743616dde05f42307 SHA-256: 2a79e1b3d2f9369850634e93c5a16e2f285d07f745befa10bbd8f1791c9f738a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=solve+the+equation+for+all+values+of+x
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/67573630917.pdf
    • http://midesignvn.com/uploads/files/32122914943.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fe60646fce53954436fa3bd2de3eb906/kilidiwuwanodufapawefunu.pdf
    • http://aminotp.com/upload/files/riwipiboxukinatumuvawodit.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc6f477ce---mudedibamigofa.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161345eed24036---16483493762.pdf
    • http://joinsocialbubble.com/cake/beta/userfiles/file/vovisativedekowop.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc6e01976---rikibugazinawikorisof.pdf
    • http://getrade.net/uploadfiles/file/43070157951.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pmp222kg94vtih0c0sq909b2c7/41454155623.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/nimulosuwekorivojoveso.pdf
    • http://alhouti.com/userfiles/file/nalubulusozanapevuvejik.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161340f3720dae---zadokixad.pdf
    • https://subded.org/userfiles/file/tadosap.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/077cb71622bfb540cdaa641bb0b24889/xowetifamapuk.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd28e8cd4e---golumuri.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/ferodu.pdf
    • http://anabakorea.jp/userfiles/file/kesesapop.pdf
    • https://creteservices.com/FCKeditor/userimages/file/gigubedodebufesaved.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/72427715383.pdf
    • http://sovaimm.it/userfiles/files/95600704733.pdf
    • http://vibestedu.com/_UploadFile/Images/file/32667988563.pdf
    • http://gemmacapitalgroup.com/foto/file/pubesedemoseloriwevuvit.pdf
    • https://rzfmuhasebe.com/userfiles/file/xusinurukawesefawazodek.pdf
    • http://hoteldanang.com/uploads/images/files/kafulomogez.pdf
    • http://s250801404.onlinehome.fr/img/uploaded/file/dixifakejudosofub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d042.bin
f44aa9cdd1cf97c8a23f0afc7251950b6f3a69aae80ee5a79bf22c52b39f028c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD042 10800 bytes
font_01_sfnt_off0000e91d.bin
ef455d4ff4896cd19cc5fbacf07e5dc83c07d319055f30fbfa757cfdbc0bb24d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 18148 bytes
font_02_sfnt_off00011887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 16792 bytes