Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab35a343b8721b40…

MALICIOUS

PDF

98.3 KB Created: 2021-07-02 22:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6665e4f840bb14ea26c57fe6d6bb6c5 SHA-1: 03e32b5bd29ab3db190f29d8de4b059d422a57bc SHA-256: ab35a343b8721b4003799a1c1f83a69829ca2cf16db12d945df1cce37ec1e158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. It contains a link farm that leverages compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a2aa7ba8b849c37d1d228fc069744a55/69530199344.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b791f58af78---tetufivovaxovevanadiz.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/43719847477.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/2210104323.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ab8828b---75709995222.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a2a9e9a0---9871712591.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/716f981b21f65b96f261da2e15ed4d8f/mevisafajexi.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/11955213982.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a682ec39a8---rapodejivorerewakof.pdfIn PDF document text
    • http://placc.info/up_image/latomamejegeganaruvosav.pdfIn PDF document text
    • https://isosklo.cz/uploads/sifosifubixolovuwitil.pdfIn PDF document text
    • http://yuli-china.ru/d/files/lugopawokapunotodawozu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077de6dcd003---xubakopobudiguz.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/243a3845497ffc2086db324826e660f7.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a449ab924a1---95532837967.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25ca65704---13373155862.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/58576090364.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/sibodezabufokemojag.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/j999p49jphaop7qbh09oakfnr6/88057163585.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/daxejowesutixakafos.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb9d1b9d2---34606166968.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/netegofasubupazakevamusem.pdfIn PDF document text
    • http://iphysiology.ru/upload/dafetowobokifafibilub.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e2a21790---xedoxiwe.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4403c0df86---fagukuxusuvaw.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/mokeguwozusevunib.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/o7lj9q68nok08dhrjtiqnvats9/xonipanubonadaget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=easy+christmas+quizzes+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 10956 bytes
SHA-256: d61d9268cd49a54d18ce93d245dca359d69cd5f5467b53ae211a3afa3a013f49
font_01_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 17140 bytes
SHA-256: 2c2b9128503879de54a662fdf4f7a1b997be3b15c6a04e094e5c3b34af42fd97
font_02_sfnt_off00014b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B56 16924 bytes
SHA-256: 722a0a874e339d12977922c1c84c8c8a2cf110d2d35b63e52b1c9fc00710afc4
font_03_sfnt_off000162f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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