Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb9536042866466…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 06:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc209991a8583bf3d15f452e1134904c SHA-1: 4e814a1a0462094785a36222781568380161839a SHA-256: 3eb95360428664668169d5da6a4a6d816f09f451d3afc12867d508d520ab7b4a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://smidgel.ru/uplcv?utm_term=cricket+streaming+app+for+android PDF link annotation
    • http://glovimex.com/uploads/ckfinder/files/6548382174.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/foturexim.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/83696bc359a3a10a1b87dcab39edcbff/53943672742.pdfIn PDF document text
    • https://limsurdua.com/contents/files/83688014853.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/vitisidaraz.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1541566886613ce65d6b322.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/vedesuginulolemababitir.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/didifesalunigubo.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/8578497594.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/92547291949.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/livelexepu.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/96203067700.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kimujes.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161455d254a4a6---kizetekabumuf.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/rekuporuwutilaweg.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/99448090076.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/dusujesedokinazelojabo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7ad975090ca4f0cc4bb69fe5879480ec/wivesusokuguwafow.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/tikanogigiditi.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/19738959569.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/lutajobiba.pdfIn PDF document text
    • 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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 11040 bytes
SHA-256: c49854fe1d7152656aec758ef41117d154c1cd87fd8e69514a338865a742fa94
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 17412 bytes
SHA-256: 24d241f63333eccf4c50fa52fbe3c72c009fa1afe3ee76644110d75e40f5c7bb
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1