Malicious PDF — malware analysis report

Static analysis result for SHA-256 f790560828774a4c…

MALICIOUS

PDF

78.5 KB Created: 2021-07-18 17:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93930846797e5f64850c9db26daf6e20 SHA-1: b2d693e288fae3a02d9fa5083ed06a00cd66f70d SHA-256: f790560828774a4c912a4dfd37b727c9e7174fd071d77d3629ba7005321db7b9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a malicious intent to distribute phishing content or malware through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://bbu.vn/Images_upload/files/dajexajap.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9d039283---18852804670.pdfIn PDF document text
    • http://alkanboya.com/files/file///17618141696.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a052b5733cc---zikazix.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/disetufezepibebediwudodam.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6bc9288d1f5e30efdff77d04a6c9197/sejajowimajobugakiza.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/5889477477.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/58141258766.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/34d1db5b06a49062e7b6a9dbacb00f0b/fafutipaxulowom.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c268a58d4874894f5d8241cc2f3ed509/taputirepukaxufoporux.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1776130640---20889513374.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607776cdb8224---44403248010.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/56322602679.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf033af91d---71096586884.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/meroxofukolusamojepozaja.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cla4jhlh1r27cq72mqklh8pvj/zutewize.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nebotogipituxagonunovun.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b112d32c7---94954400712.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/94d8be041fe4053d56d4e14acde8c078/buditipoxere.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/ea5027e7cfe7e0e3dca6a651ac99db2a/ponoguvuzudire.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/18c31bd4f23ce833591f28e72057e205/30812322079.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/pvhh8hdh2egjrvtslmjl2todh2/digozurovavuvenididumu.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/39052043405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=luxor+on+mapPDF 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_off0000d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 10036 bytes
SHA-256: fef95d0aa7fe34f09b351b4e1d05876da3c812849cdc8dad6f9574f8ffa92f31
font_01_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 17344 bytes
SHA-256: 7adf6d4cd5ceacfcb759c3b86644bc2853d86a32ec0e2c5ce65b04079020a48e
font_02_sfnt_off00011561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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