Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ed91177489c6ca…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 02:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e1048d633b44ef8637aab5ae6285be6 SHA-1: 563e6276cd8359db2598a46a40c1de8f4db3af89 SHA-256: 05ed91177489c6ca50ff4346b6ac3836a892ed751a1418709cd8156aa7c60875
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on various domains, many of which appear to be using vulnerable WordPress installations. The presence of numerous links, including those on compromised CMS upload storage, suggests an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a37cc0786b9a2034a00a69bcb720a7d2/poxaxevopufazowil.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jhrrvbd74gqippd8ogi17ocem3/nudozod.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/6008825306.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/efeb87c8b74cbe713bd99f310bd81fc4/kipilufipowapodapibetal.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/sawegemawonerafisid.pdfIn PDF document text
    • https://soechi.net/userfiles/file/sobikanegagamon.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/lowamimuxukazenemipitir.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/884eb3e78425ecd5787f389be3ee0e3f/zuwevipafisawusufuzig.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/famosonojiwobu.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/96279717057.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d21b4eac7cb46b2221135c6caa889821/88957440101.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/pikuna.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210830_55E77F347C41B5F3.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/mijejufiguminulasoxemax.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/80564072534.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/18450d036fc6c9886fb3fef9ec8964b1/64424138324.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4644e9c7b---82158083373.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/batup.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/44901949274.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/97950052600.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/poxodipu.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/42408386160.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b040c1be6---34772516060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=witch+hunter+the+invisible+world+2nd+edition+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_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 11060 bytes
SHA-256: e518142dd7e6c528f2ca69dc63301087e69909d01de31aad17cc8b389c980301
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 19236 bytes
SHA-256: 923f8004ab71e274c833ae6edaf9e39fc7ff942ac6f79fa32ebe58750354d7f5
font_02_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1