Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da87eed013e3c12…

MALICIOUS

PDF

139.2 KB Created: 2021-07-04 01:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dde7799657a99bd3d6288834636d903f SHA-1: 9b686f6a0d886b36469d61bc516af6c73a5e023d SHA-256: 6da87eed013e3c12682a960a90c6723366bb8ba8d4ea2c4af05fd04c3de66cfa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4b85bd204c4dda60a89abb397e6c292a/vobuxefifum.pdf In PDF document text
    • https://oteaexpert.fr/cite_imgs/file/96678433276.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/31420227979.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/tojaloborol.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/tedavifefoxibibewe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609827459f2cd---monujipifakarufifisu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d9357fc4da908d560c4cfd5169b5920f/jujolufarewa.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073aca27f231---82666868748.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d37970c73---36476792043.pdfPDF link annotation
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/j3311img73te7ncehokjkq0p97/15526011054.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///69735602354.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609832f8cffa8---94697163474.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/58718740654.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1ab47ba4cfa13e3d029e0b5ce68bf1e5/77633493586.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5109366d20---34858952136.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0baad2c36c77c82827035c21256a2be8/2610452280.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/84102905045.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0dd66614---68998010455.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b05c953eb---guvadikujo.pdfIn PDF document text
    • http://zzweien.com/d/files/23224310299.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/14296923724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=introduction+to+management+notes+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_off0001bd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD96 10968 bytes
SHA-256: 8234193a4cad8ee296c079a4468764748043a0b9efe2b7a34127579fa4af6906
font_01_sfnt_off0001d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEEA 18552 bytes
SHA-256: 27d714f85c9e4eabe1bd4216890ac167baa74d3b816c8d10ee5f7fd11834a704

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