Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3920aae3752c51…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 20:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2b91a34935507227e9221edceb806a7 SHA-1: 9f75988098f4da64366b46b278be305a024de2d3 SHA-256: 8c3920aae3752c5118a1a6bc1d69a651885742521152ccd5becd614f01792e76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure indicate an attempt to direct users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=how+to+change+keyboard+on+samsung PDF link annotation
    • https://greenline.bg/userfiles/file/89399261839.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/809dfdd63842d800a0189e7cb60b6d71/matetu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/15d60d8c373a7f1d3fdebfc20e765c4a/65080364295.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/19119686750.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091715550141.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/45953462297.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/remuroganulijavemodom.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/gafuxik.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/jopimupasewix.pdfIn PDF document text
    • http://turatabor.hu/media/69428498400.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210920050732_4ovtzk.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/27382654827.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/43614986479.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/nelodifawisepelinujik.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/guxuwekatorebe.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/kotufebovinikujarebuso.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/29279790276.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/sijusedikisop.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/gubakurusozaf.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c9d7d133bcf280773c798552814187ae/zukumawudakovaj.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/43997037353.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613731325af1d---vexusexalesesovidawuwul.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/dijovufekilesigomar.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_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 11204 bytes
SHA-256: 458584b3bdc2f42bb5d71d804b1ca4438af291d64757590a5df55c9b9dc4cf29
font_01_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 18600 bytes
SHA-256: 2c0ac8a0a5cc6cd5927ff3cab1f647b4a63acd4f2a327a39100c73e2e7e31f66

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