Malicious PDF — malware analysis report

Static analysis result for SHA-256 151b9b1a0cccff74…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 07:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c79a5165b7fc7ad894f904cfb3d7c19c SHA-1: 1c4da007e42ea73a3189797a62274b253f91aa73 SHA-256: 151b9b1a0cccff744152c1b1d5ddff5035c6445ac105a53f2b183729671ba26d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads, suggesting a distribution point for malicious content. The document body was unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c87e1b97f---lezunaxatamutitobafegir.pdf In PDF document text
    • http://maksimetall.ru/files/favodakijagalevolipeloz.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c77a16fa55d1a890694c7e2ee863232a/bemubumop.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/55100041740.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/28758892374.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/69571427162.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/91cp2g5nqmje6lfrigait8tip4/xefivipik.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/12388025247.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/rumejerer.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/92074816773.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26678a0d6---95285056701.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/nisirukilomedidizoguged.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/vugoxividalesug.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/ponazawut.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/abd0cjq838k3a2malak90cu501/43956386548.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b5aefaf0---68501755895.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/96667272511.pdfIn PDF document text
    • http://clingac.es/d/files/40821704687.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608838c7302f7---41069030298.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/toluja.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/jacpuvf5c63fgc8upbit60c2p4/74347956671.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/42336245012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=excess+fat+soluble+vitaminsPDF 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_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 17984 bytes
SHA-256: 9696afb1f881c685d88316c7d80c58163338355c9bd6adb077ba51740fbf7307
font_02_sfnt_off00013d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4B 10788 bytes
SHA-256: 78279afece6863477e6f764816312f4ba084b8f88b68b3c404accf441be61f1a

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