Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac5cb65fa2f9d72…

MALICIOUS

PDF

117.9 KB Created: 2021-08-14 20:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 625397e3e9a03af0184516672f0c71f7 SHA-1: e0a4cc645969f5777e127084892206584e482788 SHA-256: 2ac5cb65fa2f9d720cf5adc4d4504c2deaf71fe73a144eaa46185a8e68353945
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially malicious content supports the classification as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://china-hold.com/UploadFile/file/20210803110341578.pdf In PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/viguxiwinijowodegajul.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789e99c6d7c---dapilegag.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b70ecae55b7f74022513a00f2f2fc1c8/sagigugudano.pdfIn PDF document text
    • https://autoskola-scp.com/files/faburakukopabakisi.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/zetamerepodowofuponizima.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/09b3dcd30647369087c2a84d1639b1d4/ruserikebewijuvudodojoxak.pdfIn PDF document text
    • http://vce34.ru/attachments/file/javumezenuziwuj.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f456ccc65d---76250108389.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/575dab6325826a1cf3e364454c4b18bf/fikivowu.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/20981037339.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/v4u164p2bholiqa9m3r14dfn9v/10129974487.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083862bb7a9d---24543071833.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gegjrtdh3msi1gstti4v6be5q3/lelutoxutawifulozisabav.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a8734e3143eff4b5ea132740a5400cc/55974408113.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/78948362871.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/52742916083.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fef4d17c9---ruromibipepu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/2aeb6905c589145903860f8d48d9daa3/ferotab.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb92c7ffba---99417049675.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/nixepumogutirojomep.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ucj8dh0kpodnbjj5hinorsbs26/4155148841.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/89212948961.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab18417e81---binodume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+teach+basic+conversational+english+to+adultsPDF 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_off000169ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169CA 17752 bytes
SHA-256: 094c62dc41a6cbbeae974c7f5b7f531939a3eab30d969f5f45120ba450c2c208
font_01_sfnt_off000197ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B004 11032 bytes
SHA-256: fac10ef12a91d8f6ba2deb4a11337c1810b9f56510a20c30cd099f1a170a05bf