Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7a9d7fd112d609…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 03:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1f36cf95dc34ee10d6d779081d2ae05 SHA-1: ff637058ef78f4d2a7d1b668f3e57c6787f93483 SHA-256: cb7a9d7fd112d60946fc5840c15f5e20eb88126d47b843497ee532b15e38f561
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The heuristic 'PDF_RANDOM_URL_LINK' specifically indicates a link to an algorithmically-generated URL, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=how+to+get+free+gems+in+hungry+shark+evolution PDF link annotation
    • http://crosswaysrecruitment.com/userfiles/file/wekijezakuvazosurugon.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/dofupedijomole.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/57643422904.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/22064589750.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/noligo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/q6t425239tbq1nqskp8udqv4b4/25062024420.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ef63282b---xasarotopuwodomebinu.pdfIn PDF document text
    • http://signauction.net/userfiles/file/28013020586.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/retuzetudidavawewewe.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/17816660921.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144e36786991---77461892657.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/56983867636.pdfIn PDF document text
    • http://topflexsports.com/uploads/woruteribuwiwep.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/liwibubabowo.pdfIn PDF document text
    • http://apsons.eu/files/file/memutilelapumesi.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/70887627503.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/dunixefosuv.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/jomurifipokona.pdfIn PDF document text
    • http://bresky.cz/res/file/4848124219.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/vinaragu.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/80803085625.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/zujubek.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_off0000aec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC3 16968 bytes
SHA-256: 5df0644f3e99301df662605c4bbb36264d136934f0cbc45647ed1eadaf9f4805
font_01_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 11108 bytes
SHA-256: 83a1d9bee8d26b139c8215ffc0fef3976bb20fc735bc2bcd378d9a310088ab80

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