Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a3907a307a7d51…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 21:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84ca5265a006c1b23cc4560246927103 SHA-1: 280e13eb7ee8739a5a717513cda6cefff837af36 SHA-256: 57a3907a307a7d51c53607343ef00a3349a1c419e5bfa303e98e7b0ef1143179
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a535e0de14---mapomalerusep.pdf In PDF document text
    • http://sintjorisparochie.nl/userfiles/file/regena.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/biv55hson5qp0eafuosj6f313r/sikunabavadibivivaxunilak.pdfIn PDF document text
    • https://memoservicesrl.it/file/nerijotapizezugesenol.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/pakafutof.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/6702055533.pdfIn PDF document text
    • https://digicpictures.com/downloads/59142066507.pdfIn PDF document text
    • http://funperm.ru/content/file/65402096544.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xozoxigagorenofawugun.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/segeruwuzateduz.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/51691854897.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608310d73602c---332383980.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1fe3482910b2bd7755a71ef61429c5b5/49248353689.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/89358755331.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/13790943059.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gobugusizubimifabuluta.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84476f995---savozososodizajijerifi.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210618031355.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fjlbcf3qeqskjmi3ob9d6keg62/40863123720.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/rojupiwa.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/p6es8g2ic6metfdtqbch44u145/47313279742.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/aa405b3e37cd424198bd354895f2571a/54076914323.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/larog.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/54801648205.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f5c45be5---54203232466.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/fogexagoporogurik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dk+encyclopedia+of+herbal+medicine+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/71971139604.pdfIn PDF document text
    • 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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 17180 bytes
SHA-256: 2fe4ead05b338d346ff138e14f0e568780ef87147851acf8f182592c2983f852
font_02_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 10964 bytes
SHA-256: 711aa59cbb30a26505314b496a963ec7aef316f75ac4362b0f0562cadc46e969

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