Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72551ff330910cb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 15:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b38da77b489f39668f11afd9ceb93ca7 SHA-1: 3e8c1e84220cf6a8b79add822ecf7827e12c7b95 SHA-256: e72551ff330910cb9fdd5978f091b1d2c720c91a57c5f638cde5e225faf2956e
156 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 unknown domains, many hosted on compromised WordPress sites. The presence of numerous external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/roridorubu.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772702bf4fc---bizufanitafa.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a18063cd42---zimafakamozuxesozime.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607119a332446---lozevisesarudar.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/7125475721.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f7348481---41938521681.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/fojejuzava.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b425de5c6d7a61ed52d17b703afd2d2/39810062357.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/bunoveketuximalijomude.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/sidasijo.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/89974867845.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/42353684941.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c502dcfe1---51889045512.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a67317a1---71880808196.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758d330d636---buxuzulufizalijapugaru.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160749188d28e8---xagokudasit.pdfIn PDF document text
    • http://vucert.vn/uploads/files/19137802081.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1c7e2aca8---21609911076.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/dazusapeg.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9543556b3f---46874437089.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/76575394203.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cbdc6a06b7d1e255ed39341f0ddf1111/88704292859.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/tazebexedoxe.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-22/20210522235625245508.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac861ebab84---figudosolowid.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1382tupjo5ke9q2jgc7s5t1f38/26610439263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=koordinat+kutub+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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 17764 bytes
SHA-256: bcb5d30f06bd4fa2e98e3b67702eceb7b2ce0699bdd99d7cbfbf09f7c7b71de6
font_02_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 10468 bytes
SHA-256: 4511b085f01d4b51392240231f28f8187924284aa7b3e02da7abaa2c4d548e06