Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c67f3dace11bf6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 21:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb4bfb11335b1bc1bfe4fd3f43ede829 SHA-1: b4e66c7210116f85c8ab05b8d775bc98b012e763 SHA-256: 27c67f3dace11bf684622d237843e2b70269c888cae5f06673781d19e7f18a73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sherwoodonionfestival.com/ckfinder/userfiles/files/68839815721.pdf In PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/2240903684.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/33437483188.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/woxegadagamukixuf.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/todudada.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927f2db5842---vusufanisofesapomijize.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/sopebeneporoterunag.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa38a6d511---87273193683.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/69603935124.pdfIn PDF document text
    • http://eternoohydro.com/d/files/pabomowatevoton.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///buvevosew.pdfIn PDF document text
    • https://suksesunited.com/contents/files/gamipedesimufeniwokomik.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be772598cc0---49139679067.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/9fae3edfa7e8e81c8c01634e85374dbe/25338778782.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/98915317727.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16288174645.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/vowepapovubawivevajano.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/90974971334.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pojenosiwafevubadegom.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cc35327f350d5a49ce18325fe00b5448/robazoronosik.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b960829feb---kafofatugosimisewu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16091576955f48---zujafifi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf05151c863---74714694760.pdfIn PDF document text
    • http://apcmagon.com/userfiles/98034610346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vehicle+license+renewal+form+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_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 10844 bytes
SHA-256: 50650be12fab6903eb2cd6d30e4075f6098ed115ac250423ac89d47e2e12e232
font_01_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 19476 bytes
SHA-256: 7e35db6b2277eaeec542f315ade3d935ea891414bd02d71df4b1034ec3f21856
font_02_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1