Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca66870a970fd9e…

MALICIOUS

PDF

75.6 KB Created: 2021-08-31 08:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e53e62a4a2e39a8c585c9c631df9e549 SHA-1: f9f4acbcb3280a31f4565b8c11333dfc9912157c SHA-256: 5ca66870a970fd9e93012e6b53ad0969bd345927ad33d41c4ebfaf4c4165bed4
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised WordPress installations. This behavior is indicative of a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://pixomot.ru/uplcv?utm_term=mcq+book+for+mechanical+engineering+pdf PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeefe9cd405---wujexej.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/8b7c7a7ca728b4c3681375d55b641d49/lijupinu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/41bc479de29d4d45a682a1646ca5d195/25309325358.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/wirapirotuneped.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/kebatukoxogej.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0050551603064e106eb0b9b0d114021/89425464546.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/44c52f27aad64516a4f068cbecdc7280/4197978032.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e8ebcd880587e5b649bacf3e1fab8530/45953613944.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/43111f706b0b8eaf5653c7c4de0b072b/ruzolekaxiv.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/neloluvuvabakepifijiti.pdfIn PDF document text
    • http://citranco.com/users/files/27341884195.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb811b87c---50743293919.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210608235602_1588090761.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160821ba155b78---lagawoma.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be45699eae6---nofugoletabudewoxibab.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/b1v3bjccd4vor3ej1bhpdebe4u/zidinanojejuwenijamur.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/fisawevu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec44352c6---16618681330.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kuwujabituzomebafakabi.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c794494e61---letitulefomalanujajedalew.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd7ed0d976---sosukejax.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/gogopozowiwukifi.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/faruxokolotivuki.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_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 16260 bytes
SHA-256: f6236574fe8b2142db11883683efe145112fae728ac17bbdeca0afba5f566e9a
font_01_sfnt_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 11172 bytes
SHA-256: f9275aed09f98759b7a2343d780158c6491b3e0b3ddc2557709a30c05a55ce40
font_02_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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