Malicious PDF — malware analysis report

Static analysis result for SHA-256 368dde302607b1f7…

MALICIOUS

PDF

80.0 KB Created: 2021-08-29 14:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 301a2f1d8b6e6d4dbfe6d9f3ca577037 SHA-1: 7437c52c0c28af93d2527675edd42ece30624f75 SHA-256: 368dde302607b1f730fdc6dba9e34c4682a7775bb80bd2afdfafa3656cedd0b8
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://erdivigado.hu/userkepek/file/36648585543.pdf In PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/nobavumobe.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/wopejarawejotuzidumiwexib.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c619e2e78---degedivifajimir.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/juvefoforalobamameda.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489752a873---74240639852.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/61812224148.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hmralga1f56dh74d9vdob1g5sp/xokizasajetolamexewovit.pdfIn PDF document text
    • https://esz.jp/img/editor/files/bedivagajawulurupa.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/99812684664.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/93400178196.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/c7f354fde97d258835a14ae2aeb5d1d2/34255687826.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e63651114---juwenalora.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/difevagofuzovexinupu.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/98274274616.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf208a0b97---12672933360.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/taxifaziraponaku.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/4kr11vjt48a56iqkanq3locims/58095206498.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca722cfca---jivoresinaleguzolujevi.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/97121195432.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e4aa165dd9e79397e6f1439dcdadc932/67381691161.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/32571a50280e2a799bab009920341b09/tegugimolujij.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/vuvafobepugarozuwevupebo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/lks4a98fgmas1u9680dov7sldh/garuwivuwew.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/kezazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+a+flat+stomach+in+3+days+with+exercisePDF 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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 15584 bytes
SHA-256: 27fc3eb80ae0d7d329d119137e6117288ef54c85fdb6a8115e4487dcc5191e28
font_02_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 11388 bytes
SHA-256: 255fdfdce057cf80d68a1bd2ea1ef6617f90634d649226cd719f39b29919a947