Malicious PDF — malware analysis report

Static analysis result for SHA-256 183322a9d4d0c1a5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 05:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81188eca5a0cb2146b4213e6db161690 SHA-1: 226087dd5882868ac1e2c1cf4970cbca6f8d5410 SHA-256: 183322a9d4d0c1a59638d6210286c578e18f5366e3228680ec3eee9f1ef361a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These URLs likely serve as lures to redirect users to malicious sites, facilitating phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bienenaktuell.com/sites/bienenaktuell.com/files/file/74329727742.pdf In PDF document text
    • https://support-trevianum.nl/userfiles/files/resabejilomusedetor.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/29782171833.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/wilofis.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/37736584428.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/27768375128.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/65613341993.pdfIn PDF document text
    • http://chayka-svg.ru/files/56117900039.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61372e18447e7.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/179066678612f0c778ed69.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/funeserisirufebatekamixo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0021a1322c70e3a01d1e4ee5d2157c41/xisetap.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/6117217848.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xowawodezubemo.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/54731582263.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/jorexikodidumefug.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/82012718689.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb658206ff---mimoxudapelodigebawivu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e64ca5eb97---10817000068.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/74f499cea155320647ede4d887cd23c2/83748316731.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/88996036900.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/80151996215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+photos+to+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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 10236 bytes
SHA-256: 6b2db585cf0db8de1e4bbb4a0711c6fcb72518088ca009c44a1691421294f6bf
font_02_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 19148 bytes
SHA-256: 447ddf597699b2c8b154b7878013a2401c91393a6c6bba17766e9093e1812eeb