Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0f742369805ece…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 07:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53a52537d22523ad70b31490b1d170f7 SHA-1: d6fc1bdcbc0327281d203d570e43086616071990 SHA-256: 7c0f742369805ece83f2f3a7cb6fc2790d0a7dc42915a204d78f5f7a3ba14888
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external URIs, many pointing to compromised WordPress sites, suggest a link farm designed to funnel victims to malicious content. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=direct+democracy+vs+representative+democracy+pdf PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075c804870aa---29582742310.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/42820906990.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d622f261---89701535969.pdfIn PDF document text
    • http://edgecs.net/documents/45972224458.pdfIn PDF document text
    • http://climtech.com/files/files/zimogol.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/43022610453.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/80f322ad28dd63852b055240d525e429/livotuzatokobi.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/nitikelowi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/28378ac950be0099d048f37e4a6bf87d/11339590765.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/pewikisanatanen.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607567c56b902---4845168776.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40eab94d7---koname.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f490758a56---bumufi.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/92296386553.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/38711589501.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6bad96427f2e5c70171415066e735662/vuxusavijowuverodewug.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/waxitubosiwot.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608374823bc7a---nisoditofew.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/nuxutegepabi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/89522175474.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/komumatatumeletevexap.pdfIn PDF document text
    • https://zhansq.cn/upload/file/xepowemuxabudex.pdfIn PDF document text
    • http://lukinserv.hu/file/47074954598.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3da71ce0---fojagatakiwos.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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 17644 bytes
SHA-256: bd73ac4a20593aac07d153a2b808e19350b1b9560eab45dc57c99b6399f7f6f2
font_02_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 10916 bytes
SHA-256: f08cc54f9e818e6f3380cc8681942402b93c4a7dc2fc2390d59ef7255a41ee24

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