Malicious PDF — malware analysis report

Static analysis result for SHA-256 9830f7400e70ce99…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 05:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c560cdd62c41c5dbed083c33e64e5a64 SHA-1: a141823e0aa967971c5c409f5aa0c8ca660b8278 SHA-256: 9830f7400e70ce99c2d3bc34bc0d714812e4ec3f1cd613d9bfde99e46ab5421d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading or interacting with harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://theponghop.com/upload/files/65824571780.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f06df479de9e443ffe040dfe9434ddc6/20211503127.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/36522009633.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d067031fd56---wowibogexoredunodibogo.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/wemoboxikelaliweduvirib.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/poposuka.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b129a3b2be7---laxavavixidokopepigozim.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc6eef18c2---lanawafetutemadasiv.pdfIn PDF document text
    • http://kasargod.net/uploads/file/gobedijinopete.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947db0b4875---2419026854.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc84eb83e---98572767849.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/3737420485.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/darobemuvadabe.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/62615220689.pdfIn PDF document text
    • http://ktcz.eu/files/files/kobikajire.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/45546074760.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb160bdfcf---vunudubopeseneti.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/11382583120.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/bajuzipadif.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e00a5ae6---80456437176.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210724112152.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/1624638956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=autocad+basics+book+pdfPDF 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_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 10544 bytes
SHA-256: da7eb7faca9926c4d682c1838e1f3da2aab11ba7199508d7e020e5a8985a667a
font_01_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 18148 bytes
SHA-256: 39e40cf4c42bc3eee84c3d9d4b07d7660d2faede32a9cb5d493689344429d097
font_02_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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