Malicious PDF — malware analysis report

Static analysis result for SHA-256 1590ed0692bdd0f8…

MALICIOUS

PDF

139.6 KB Created: 2021-09-07 09:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc00218d28742bbb5349a3f95e9fe790 SHA-1: 838a6c871699e87764ae2276dcc8795f0bbf1fae SHA-256: 1590ed0692bdd0f85fea549df101fc2778f5a644ea216428a29010fdc7cfdadb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files. This structure is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16095b1357b64d---tobuxakanaf.pdf In PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/fepolepoku.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1c78ebe8---7656006832.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608294cd68460---80556915503.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a034cecef4f---10894541668.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xedexovewi.pdfIn PDF document text
    • https://hepiran.com/cache/fck_files/file/58463478414.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/16507079405.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/lusoratubagesewapexoxapo.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/77506944092.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/pupokexudula.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea81a8693e655804aa05c3f6841f4036/lisebidokijezupulel.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210603072810.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cf1508f47189bd26de8c80badddfb5a2/bikavunaseluresifo.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160865654590dc---bitogasegek.pdfIn PDF document text
    • https://andana.us/files/files/11439629960.pdfIn PDF document text
    • https://beaszemin.com/files/43832529475.pdfIn PDF document text
    • https://tomas-music.com/contents//files/79162668916.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/83q1nvofam3d7r1nmeia7l3496/71617270690.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021082600123838.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///24800494295.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/lobilatevob.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/cgo6lvs34uj9fpal1pfn2nrpb1/59646116248.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8fddd12c---ginus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=materials+and+their+properties+worksheets+ks3PDF 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_off0001bf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF87 10832 bytes
SHA-256: 30baf2089c3fc3d844d6d15091599cc0bb589792cb2fdc22919138447130786e
font_01_sfnt_off0001d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F098 18312 bytes
SHA-256: dedd0085c379bd296432297685f0a696702ee67750d07ea2fde84d3f9ac2cbde