Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61eb1cc062b8073…

MALICIOUS

PDF

75.4 KB Created: 2021-08-28 03:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 359297c69710542463d1c0699631f529 SHA-1: acff23a77459b09b63ec2ba8df4b49edd684aeb8 SHA-256: b61eb1cc062b807375e028e474233d14e38567772f69a205d50965e88170b134
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5d6t85muqoccof89g5vh6t0ara/puvotazevinuf.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f8d73811a---jufebotitimolugewojazebe.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/94167133242.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/zurorapemodujovinakejaz.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/76714008839.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/78b5080b66f4ff54de22b9d797db0104/kafisizibedagomodo.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/xupipe.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://ancoraeducacion.com/images/senavinur.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/824960082.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/sudorixipapa.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ed92427d---jitapuji.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/mixuvitel.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/7521200876.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/58180111235.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/98938860734.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/66540523161.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/60250617923.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c1813285---89827451591.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/82468d78e4ff96f19de91bf51129f7a2/lukolozeda.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/86c842e4fe674336a821c3ee41b6ca06/4407752.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/db247ddb66b40ba2abb57c765aef2c68/sabepafejunagatis.pdfIn PDF document text
    • https://stvorki.ru/files/file/rafori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+5+how+to+get+vehicle+warehousePDF 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_off0000c2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E0 10832 bytes
SHA-256: 4fd53f3131b4972868416732f80205a28ce185a13ad2024ce7c384900d6811f2
font_01_sfnt_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 16244 bytes
SHA-256: cedab311ce50bd908925276c72f9b43e55a0f69da0a914d02fff99863ca46f57
font_02_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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