Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2b81d6432e16e3…

MALICIOUS

PDF

87.6 KB Created: 2021-07-31 20:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dceebedafb0352235e041093922f53a SHA-1: 89cb7dfadb6bbc159caf76996bb10cf75f89e172 SHA-256: 6a2b81d6432e16e39b6556c2f4c6fe39631c9d1920b19e8d911d4eef6207c2e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and other domains, many of which host other PDF files. This structure suggests a link farm designed to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160705818df5c3---44861778123.pdf In PDF document text
    • http://sys-svinding.dk/userfiles/file/kagivuforurepulenig.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/40739dd4c7314c6e06e852c9ddec37e8/zibovu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7ecbd3a2---sisajalezeronatawex.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/gilotokagawofuvowux.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6306d657e7930c40d457af54be4600ba/47649297819.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b773018f2e---pufejoso.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b995f00c8e42f47b387dac98a7f3bca4/kalubexufemutevaso.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/82750446658.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/gajux.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/vamutebapigisijikeredi.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/sagawin.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/95952583056.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/42470516978.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1a289e6c---tumadajenebufixomujejago.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/vunurowotisenuv.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/34823857058.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/726af3a8ad745507a953a589665d1ea5/xukudekut.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec441bec5---mujiler.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/eec4a8391d67f4e52522e225078bd2d6/26537655193.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937e60d411b---valen.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f24b9ce14874f1ccfd4621f701fb30dd/95216912909.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6686998b3---33584535281.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/tonupur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=como+hallar+area+y+perimetro+de+un+triangulo+rectanguloPDF 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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 11036 bytes
SHA-256: 10ecea2ddb0673b9e7555fe5fb06febc6d9c868e2bc09fc405b3f95afbfff400
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 18384 bytes
SHA-256: e9303667989b32897d34a47cf9954f405eb37fd32d94f04cff1e865d92b18331