Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c198f9e0f3bfd7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 15:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44376e1ab0f1d4691b481f2dec902996 SHA-1: 98c678ffee7a072d63890442e0e654ba0b0cacc4 SHA-256: 51c198f9e0f3bfd71cc67bc3f9818dd06eb3b6289748d3b7033dcf16b6bb9616
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites that appear to be part of a link farm designed to manipulate search engine rankings or distribute malicious content. Several URLs are hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://lexcyberia.com/userfiles/files/52800755877.pdf In PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/61557102394.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/57128430079.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/negakutikegorixaxo.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/kiderixuj.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/85878087590.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210902160514.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/80901569334.pdfIn PDF document text
    • https://iohrp.org/f_files/files/46928952678.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/12874760989.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/86983825747.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba3c7429a---65406030709.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/pijefiwapepuwofenupe.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/gupevomazoton.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/sukes.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/jitil.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614273441dbe3---gudomubumokufenalid.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210917105456_r95oj1.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/6281995245.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/23279346005.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/dilutirupuj.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/81917497459.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/8c7884775ef13e423f26e48e8f20993e/mipobonirojawoji.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/suwirefopitatomojuwowigag.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/luvuw.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/rokiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+transport+a+fridge+on+its+sidePDF 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_off0000bc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 10704 bytes
SHA-256: 8a8d91ee649c3e80fac60a6e91669b128f2847f8dbdddd1800689a3991558a8d
font_02_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 15252 bytes
SHA-256: 70f4b4153a741c49754ea8d324c4a36ba1635c38de23b405bb631c4e484b5e05

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