Malicious PDF — malware analysis report

Static analysis result for SHA-256 b954ffcdc79d24fd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 00:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a216f9d67ec2efbe5372c6f3404afe4e SHA-1: 3da867e7cc066736333032c2192b1ecd7914cacf SHA-256: b954ffcdc79d24fda41d61f7af89fd586e2b965c3c6e4cf571f171ecd42c12ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users into clicking them, potentially leading to phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160747eed523dc---wupapediwuzosusawifu.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31854222aa---namopodigetiweje.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/56720855175.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e77613957a87d5eb5d2c360dc1cf0b71/gujibaxekunivakukifuj.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/11245122307.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/netuva.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/444547fe4e7f8186012a5f1239cb1ffd/lusewigimafukewu.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/52912404220.pdfIn PDF document text
    • https://eclearusa.com/images/file/82337717387.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8f628710932896b77b179e9ac79e40df/44152111049.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/51031021838.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a808eacda---42919073040.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/3a22ue5bigir5oqilp675bkjlk/ganofizizilafoxik.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fb5506acd5675ff0de9a4002fc33862a/25046015705.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/87629196751.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d3e6646493bd3259e561fc16e1cb08a5/karalo.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/77639347159.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/xezexonijumutod.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160989aa1a3831---17194165213.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076a59fb3818---xezuzeduwipilakijixuzu.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/89306052663.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a42e2cf8e---kolawolikikowuto.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/1b8sk5vjdldi59mbvsf2qa9rb2/rajadudejoweno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kemahiran+komunikasi+dalam+kaunseling+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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 15868 bytes
SHA-256: 91d2c7e234ba150d96621147e9a4939b2ff76b15bc947cfce802d52cd4753312
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 11028 bytes
SHA-256: acd099549efec838b7aeb5f6a1bd8e19c68830103025b839aefa44a7a19464ac

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