Malicious PDF — malware analysis report

Static analysis result for SHA-256 7731e656ce9a328e…

MALICIOUS

PDF

91.1 KB Created: 2021-07-05 00:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4c3c9a08f48d0e4a38164f3ee863ca84 SHA-1: 452bc1aecd99cc6703f9c820f7ca00c3f7445f20 SHA-256: 7731e656ce9a328e1f0225c84bc0b3715644104585348100e812717feb645a56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing or trojan variant. The primary function appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://praguetransfer.com/files/file/tenobugesobol.pdf In PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/baafeaf2d812f66caedac1674c21c1de/sukomopovexowuvijakesekot.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4f22fcb7---15603320992.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/70fc73090cc0e963e7c6e5e5f1b2b733/rawosaj.pdfIn PDF document text
    • http://chipgene.com/image/files/20210703_115321.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9d98de90---nekakepupupetomomufom.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/990d1271e85f223fd331ec6d7e68e757/wetaradera.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/fb2ee46b219cc2f272a23e0a5a0350ea/53629766192.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f009b94fe850da35dfeb959218af0bc1/20260468156.pdfIn PDF document text
    • https://altbuket.ru/files/54968845034.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503205437365229.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/68310995271.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfa64742d09e1212249ccf8e328e68a4/dokuduzomebiwebizikakek.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608922be8e22c---ravezerapaxovafizogujo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc080bc853---kenaborafar.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/danoritugaver.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160727137dd909---dofolosopoxomekow.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/fajujabegubafepov.pdfIn PDF document text
    • https://ever-progress.com/upload/files/fokepewozejo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9b43edb4---8548207355.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/24528035112.pdfIn PDF document text
    • https://schmitz.cz/res/file/78793632362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=use+acclaim+in+a+sentencePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 18776 bytes
SHA-256: e7c0674aafb262918220e345845ad823d7562b703f582bf44d6794bfc319dfa3
font_01_sfnt_off00011ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 4436 bytes
SHA-256: 2cc89d5233bf410cd9bfe0a019a855efae8ebb96c93eca16d8c58b81864a1d27
font_02_sfnt_off00012f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000147b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B3 10180 bytes
SHA-256: ead917ef2c81cd689a1f69d16385173f8bbd2e91a96f436cc1dc1b053a43a00d

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