Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5b609854504a5e…

MALICIOUS

PDF

83.9 KB Created: 2021-07-17 05:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d6c9c97bf0ba9afe706e1e55620e6293 SHA-1: de7d2f62276d068ed7e3e0b0dd4dfed2d779075f SHA-256: fc5b609854504a5e5c211cf0ed63878b0d4400bce55083cbd26f91991fb45f4a
156 Risk Score

Malware Insights

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

The sample is a PDF document identified by ClamAV as Pdf.Phishing.Trojan. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/migega.pdf In PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1bf82c65c385dd08b0ea8ddb005d8c28/45845159547.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/cc3a9e348850acd0f5778798d4a636d8/rutisopafif.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/779dc14a7057d189f337a04cc0d87e7c/62936218285.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cd1a212a212dabdc71316d0b769c41c0/dobopaganasesine.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ot1ps79539rkbemt5kjckbstdf/42738171275.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/15652548937.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/iod5qcoajmpji7nakg07glt1ep/79578665663.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a1211561---95347213564.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3278ae320e23c35ebad4616ba997f6d0/14637483820.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sewolevixadi.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/gazegadojitexitonak.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d13911a88---91928890380.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e3c32355---13311990089.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa3ded552d---48529946147.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9afb2cacb3bead13b0ae98544712efd6/lojobema.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/zikunomunedadelewik.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6dbeb82e03910319b6a8a81f6d0d0dfe/voxasigugikubuxa.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/37774478802.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8ab18d3c---tipadoposotebomo.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/bimaduxezitilovufifok.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/gjb76qq120rasjkr55mr7ma1gq/40193917910.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/sulevokivarosezujivibi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6a6ba899---vewufiwapurej.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/8938446109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=late+onset+asthmaPDF 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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 16956 bytes
SHA-256: 9f0a564f0b0738cb5f7d2c9f398a49f981803463fe97ed4e42f83cb1111837c8
font_02_sfnt_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 10092 bytes
SHA-256: 4f6668c05b3588ce92c49d63e580e65fa6fa902b5480d2dcba5430fd446c8346

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