Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a8ac2b2b9677c4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 15:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7b226a7a71a721294ea38b9fbbd00a7 SHA-1: 0a3b3f04b1e9040069282a8dc3922a97e08e2961 SHA-256: 00a8ac2b2b9677c4c66c5a8e447f2d66cc4e03a5a1abf3e31c136578784af3fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://studiogiovannone.com/userfiles/files/bitaw.pdf In PDF document text
    • http://birzebbugastpetersfc.com/files/file/kimizenirerofaxisipi.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e8e272ecd4d6d6846e7764f2fca5aaa5/biropumup.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5775d71638---xowirikogijijebumagub.pdfIn PDF document text
    • https://manenshop.com/upload/files/fotanatesidew.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/90654777882.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609548bbb1ab8---65415638550.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607744530de55---mibojipa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/duoo76ducduqh2qchukm4ml201/wifeduja.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/mezuna.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/86436745211.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d351eb5ac9---sofutibozale.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/tewipemevulanelopofex.pdfIn PDF document text
    • https://istanajp.com/contents//files/52706658636.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/89040522888.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/955a60cd762b2c5751f051ccd0119ad9/31939519248.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/wavano.pdfIn PDF document text
    • http://bem-sa.com/img/file/midusididozerevov.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0ec3fa545a7a05cc104fb8b1a616f6d5/benerolaxi.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/42924572898.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b2cb8bb975a8c963962022dc74572f2f/kiromatexevif.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/wezugadomenazasivonaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=como+dividir+pdf+en+dosPDF 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_off0000b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 10452 bytes
SHA-256: 6746b94ac35a537a4efe9d3616ebcedf9ab5fd9a183e9315770ae9a096656b3a
font_01_sfnt_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 17104 bytes
SHA-256: 602d71fcdb96ffcc8366b61da226020b7635308dc0627204a3407205b679964b

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