Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad3d1f37f1816b0…

MALICIOUS

PDF

84.7 KB Created: 2021-08-20 08:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbc231d13a6f6a0d7ac76a2300b975ad SHA-1: e1a425f49e41938eb7f4eb48e460cb80d760d1f6 SHA-256: 1ad3d1f37f1816b0b825551e8e3aaf7ed9dfa8d9e7ad0febc4d08e0f1f09b793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially untrusted hosting. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages, likely as part of a broader phishing campaign. No scripts were extracted from this sample, but the structure and URL distribution are indicative of a malicious intent to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca072bdbb5---5600217274.pdf In PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/satuvanogiluzofukod.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608648bc46a91---29515238697.pdfIn PDF document text
    • https://fasleh.net/Files/files/38070840211.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/p60h981mi9ul2dqg39btj8u3lk/bazodukejejenewaxula.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g6msa59v568jhn94mfhf1on9sp/28606175241.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160722db67de36---625859291.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/10184924635.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/mugexitovib.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b322562c847---viratavewiwipatus.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/makonojogeze.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91b0470ec---filubanonisemivogipoku.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/kefinunofe.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e8171462d2685b4265764f9c48d287b7/68183327260.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607202c48fd21---79694896430.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p8dinn9o3npj5h2gocgmm2bmul/sakotetanuvojebo.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/31132517743.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/49172339718.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/rabifenisivanabuw.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/38221850907.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/22816560287.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/96737772188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+does+limited+service+listing+meanPDF 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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 10876 bytes
SHA-256: 2c0d7465bd90cd2c9febbe455b68f4f70e95b96dff8ce1c3a8ba05bc3e05874a
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 18360 bytes
SHA-256: 60c609b1af6df086a566cb8512d415cdbf8fa03bcc1ca5b6674ce36813541b05

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