Malicious PDF — malware analysis report

Static analysis result for SHA-256 855545fa313d20d8…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 23:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c04a39157bb5cd6dcf01bf0910a74e9c SHA-1: 2dab66ae1e9272d459d29012a8c9b8a2f6fa0e68 SHA-256: 855545fa313d20d86c88a2cfd2fba6a9780df7c320a4d9b7d2c5dd4c5c4f3889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://stadion-zarya.ru/ckfinder/userfiles/files/1810810971.pdf In PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109122245039826.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109141626335793.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/medawikivoroxerebabis.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/27993650788.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gifasivexewenere.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xunalowuwomaged.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109180951359446.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210930213105.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/luregijaluj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9268676c---15954364120.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210912_140624.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/wuketitinejifidaviv.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/48135704449.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/80158531967.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/d03f92e47af893304d6c6b34d31f50c7/nogiwibibimezari.pdfIn PDF document text
    • https://rubfila.in/files/file/77297745951.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5d3e3d0b0---17120335879.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/95927852949.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/moxuxejajesujuvexirob.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/45443167536.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/99311302830.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/76545927143.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/87516393341.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/24371932682.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/razewaxelodurofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=noise+in+ears+not+tinnitusPDF 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_off0000b546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB546 16308 bytes
SHA-256: dad0e93ad2a608f89f87cb7cd87682fc25a551fa42d9696e95973d101920d832
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 10132 bytes
SHA-256: c382989dc10b09a49b7cf52e200258cbe453e43b6feade1d516092fc0b0fb667

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