Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf79f3ea4c784584…

MALICIOUS

PDF

57.2 KB Created: 2021-08-31 07:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2b2ff66627e8eaf62d88a5a473aac50 SHA-1: 85180a127ca494a20c375b9571325b871a37c6c1 SHA-256: bf79f3ea4c784584d10a1b5e563448aff957d1fdd07cf90f8c55dbd756a5554a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9561

Heuristics 5

  • 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
  • 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://whs1979.net/clients/65916/File/jutolaxizabamenoso.pdf In PDF document text
    • https://perfecthospitals.org/FCKeditor/file/vubegoxofevo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/781316634.pdfIn PDF document text
    • http://ashioke.com/images/library/File/22891724003.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/49548254898.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/55333609690.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/romugagu.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/57692188306.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/rue22dh08460h8272r143dbnri/43070432807.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/00a522b37bad32c83d6f3adfe9a0702b/92033976305.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/regojanife.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/89081632164.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/70973910677.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/jagagokuxumobuw.pdfIn PDF document text
    • http://congluc.com/upload/files/linugozi.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f34b98dd413---57250442252.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5fdbc10aea40b44f9f105b82659f5088/36085068016.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/38qmpji9k1q1nbnklpnqsdibl4/17435043657.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/fuzarotalikadufiwo.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/budabomelipegegagipafa.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/82807398648.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/xomanasolurolurap.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078643297bd4---50034490829.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106c08cb7616---12933637079.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ba2a2b8d8f854ae0cbf5b15080b0947b/gurusunigirovefewodanidak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=example+of+double+fertilizationPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AE 10876 bytes
SHA-256: 5199027b681144e72e8270da8a2e6737c2f61fa623b3574541438537acf0b3b2

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