Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dfc1b2ccac7371…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 14:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a4d4d004f5912820446c9a59eb38558 SHA-1: 4eceaeef6e30558db43bd87555633ee59713b83b SHA-256: 66dfc1b2ccac7371673799513c4ea543fa851097ee85939d2beace907f19d149
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm and heuristics indicate a payment redirection lure, suggesting it's designed to trick users into updating financial details. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://smidgel.ru/uplcv?utm_term=where+are+you+best+reply
    • http://armanetti.com/images/69914350623.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb57de1b2---kisatanekajiwifugubapabe.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2f8726aa---56014195954.pdf
    • http://www.bufolari.com/public/immagini/file/bekuvevujodijamifuzusa.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd67962a4a---46257042809.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/s9af3poc3iropm4o0qkigdatf2/86530884618.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085be1e6e64d---kejuwebisiv.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7d8ca00fca54e45f3b2643694d4940ac/patimotojorevomojod.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c93ab905---23687667031.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074671f6784d---9306265734.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/78318411143.pdf
    • http://bjsprt.com/uploadfile/file///2021051817432397.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/9a529635a6c6521a6c731fbb18459a44/jatorusadininuxoma.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090f49c2b9d2---11174886341.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea3a58d74c---73732995302.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/26cb86ce1dac251f372dbceb23c62065/65288127952.pdf
    • http://msiutilities.biz/documents/41608534554.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/9p6fmhmn1kmsqrej3hq6ltsttv/tubuzusagekeditudisolixo.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/549151050b7f1831603d3e55a0d05422/62422958182.pdf
    • https://lacecinella.com/writable/public/userfiles/file/90865307952.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b39a3970c---32707643764.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 16792 bytes
font_01_sfnt_off000114e5.bin
b1c46292129bbb7a13a31d90d48635d6c98b8270d8aa98c506d25ea54d486907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 10500 bytes
font_02_sfnt_off00012cc5.bin
e49b93730b347dbf14ea3d87689158ab59f8e0150b6e21380b8aa26a53016912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 17220 bytes

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