Malicious PDF — malware analysis report

Static analysis result for SHA-256 0540b81fbdf4bdd6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 03:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc966c25b97f263367a6c01fb0c6c976 SHA-1: 47bb145e1389c062e464a02d9b917bee15e8cdf2 SHA-256: 0540b81fbdf4bdd659bd6ad77160226d07fd71e02034d41a9892985d8783c46c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://synerhu.ru/uplcv?utm_term=turning+right+onto+a+dual+carriageway PDF link annotation
    • http://komodovo.ru/upload_picture/58989747611.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1dfe5f835---57186815673.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/17928991596.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/20426349579.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/52263234417.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/xolukoxesafube.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115670ea551b---nuferututidivumulinejim.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/afe1aa3497176aeca0477c496cf13988/kurufojatomoravugamajer.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/malejamavagisaletega.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/7439829961.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2ead5080d7d91a4ab886cf08eacc063a/33971465767.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/xejuxulexipezu.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/risirivimokewuloziv.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/gejudakovigobupoju.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/nomojezavodises.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/89160091175.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/j94hq1116k5gkl0q5eqavcela1/pukofukinez.pdfIn PDF document text
    • http://asustainable.com/global/file/bumafebuxola.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/55901092236.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/sutaselezakexobekifije.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52119405535.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e3b6b052b3e609868b3e37ea2554bc3b/72981808437.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/pojedefosisufokaf.pdfIn PDF document text
    • http://apsons.eu/files/file/bupofonakupe.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4cd4c84b6---95298736857.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3li0h3ltbsue1n9iv7dvebisr/41245652366.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf285eb571---milisuv.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_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 16764 bytes
SHA-256: 528beaac6b16e4e346253f1770abdac8ffeb80cb534ff691f154608b30a73d87
font_01_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 10744 bytes
SHA-256: 2ded1ebc2906787bc92fd524308280fbbbb440cc8f8c9e9fb99265ca04e6e070