Malicious PDF — malware analysis report

Static analysis result for SHA-256 7090845e86966803…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 14:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4516f7ec8844282a5fb5fe2ed616b4c SHA-1: 908c7d86de8356067a162d386e2307deec064479 SHA-256: 7090845e86966803d587d075056b68fa6c05f4dcc0e4f82a2e0dba55a742fbf3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to external sites, many of which are hosted on compromised WordPress installations or disposable domains. This pattern is commonly used for phishing or to redirect users to sites that host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/00ba3a33c92df16a16db2938cd0bb49a/xanesunutaregujubepevoda.pdf In PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/76672751548.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/q2b8f6c0aa4mtahnd8q350dacf/31381059814.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/balojimipigolipabufukot.pdfIn PDF document text
    • http://yanartextil.com/firma/files/61055229311.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/25653013970.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdfe8cc178---6993140851.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83ef00a83---wobepar.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/62165366342.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/15653004879.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/wasokoxaperokaxasapot.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/37760042235.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd2e3e366---runewakeku.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/gaxexuxujiperevevipu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eea675398---44194561847.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bemes.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a3d96495---pivodewewufededeviwa.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/n832j7ug21j2o7tbkora8ml7o7/fegafawimopokomivatuf.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/zokemolugaguxusenovinejo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b957f8b9e09---dokeguxikakamasupo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc7d9a60283---54552025920.pdfIn PDF document text
    • http://naucseto.cz/storage/nikidilofozefisoxavepujo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6e15eb5f---wuguvinekojipenutikex.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/96390415142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=s01+1080p+camera+module+instructions+manualPDF 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_off0000c07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07F 16548 bytes
SHA-256: ce9b4965d95f7059c7a2d5657e73d65dd8aa45f79500a7306a08d91f48c6992c
font_01_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 11232 bytes
SHA-256: 0cc2f6a75729817dcee7d9061c09a1b725c5c347b044984e3f1a97009df2cf36
font_02_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1