Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d608f23622ca69…

MALICIOUS

PDF

85.6 KB Created: 2021-09-14 05:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a5aa949151ea8e0ae2df5f2cbff9ea94 SHA-1: 75fa0bd50f9243eecb7246c7545b05a9011420ba SHA-256: 20d608f23622ca69df02bdf1f6bc5040beae6a4e1cf5138523fc09d3139cfeb4
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 external sites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

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 http://mnarch.it/userfiles/files/rerolofapiwitof.pdf In PDF document text
    • https://masukpt1.com/contents/files/motizemisofejulinopive.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/19186545898.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/57835535825.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/fexuniloli.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/tefefa.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/sinolazosamil.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0584d82f597675645264cd938b9a76ae/3132357124.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/bujurafuvov.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/xovebepigopolavixug.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/73302073814.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905110219.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/xetovefogawejaxalopot.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/29480891515.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/gikitazuje.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139301e3e3ba---19217531077.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/47418023414.pdfIn PDF document text
    • http://ceroki.com/image/files/91137873630.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/rubajuvuzugojitedevimib.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-11/20210911090121251408.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/fugakasifopaxa.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/bibumatanuda.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/710abdbb618695c4729af501c636ccb7/15596467187.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/57957929724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=m64+emulator+gamesPDF 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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 10592 bytes
SHA-256: d69b6bb0e3932b2328f5bc1e62dfcc6d745a6a89b8fefbcbad91392c66e1f20b
font_02_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 17976 bytes
SHA-256: f1e6e8e341286021d9a3f375d0e29b6981a7a6f952bd0f15b377db16f10667e8

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