Malicious PDF — malware analysis report

Static analysis result for SHA-256 166e1b1a417241cb…

MALICIOUS

PDF

87.5 KB Created: 2021-09-03 15:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3e2eb010fd366a7ced6724dcdb192a0 SHA-1: bafbd7c2e75545938d27aca701985cee4f6eadac SHA-256: 166e1b1a417241cbaf94cf4b1c61e8659f830f89e37d2a023fced1da9a5419c2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://taxicityplus.ru/userfiles/file/varazat.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7m65ouiumf6pin76drvj1d83ul/6687115641.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/4631443528.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0f711008---luvaxirolutupetepudisuze.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5de8d76d1c94244d9569df142ced92f0/59609050571.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faa4454250e---ledoxix.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/20846471203.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/49334611258.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/tibak.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/padoguwaw.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/87bdb578c93b09d0efc48196caba4c99/25184996033.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/fowetemefovipa.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/xevim.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/41163994672.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/23408635052.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a434d0d3c0---15236730734.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/talexev.pdfIn PDF document text
    • http://technocom.pl/editor/file/zemivaxejuzuzefeliroxon.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/84002418100.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c3e81f97---11050158669.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/82935406071.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/92760921192.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/89aa07c784527c1030d5cc956289db31/fokafevisegoboruxijofefox.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a97c0420a15a1e00a172205836f1a060/15024350004.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/ludofolegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bartleby+el+escribiente+pdf+gratisPDF 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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 19596 bytes
SHA-256: 0030f7e7533e6beff69b24a76169e4c1418e0ac11c20bdfe5574b44cd7b3d59d
font_01_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 10984 bytes
SHA-256: 46862a0ba1ddbbe3c6b2719bee9fc9d6d5d26c4fcdc2c561d0c655d873ca9d7e
font_02_sfnt_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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