Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d275ce51271628f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 03:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36c513a64b6874d75f5f64d45f83782b SHA-1: 89d31eeebbbf34acacc2f6eaa3dfa530317a29eb SHA-256: 0d275ce51271628f7fc6fcc2042b133f8d3f6d85a8b7950fee240f6ccceca382
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5dc99a8111fbb57f9cdc93575f34381f/78413248179.pdf In PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/72884146760.pdfIn PDF document text
    • https://netpage.info/userfiles/file/96281235891.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/wunama.pdfIn PDF document text
    • http://shophouse.info/images/files/getalidososefironojiwi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb59f1497---6968806640.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f2e03b9b---61422882300.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e3add100---perupufodekovikogivo.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/mowozavaniwuzediwiluj.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ad2e7668bb74decc37e90167305328ce/6687756577.pdfIn PDF document text
    • https://pindimana.in/uploads/file/35921297449.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/nujuzavep.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bebf65aea00---tupawipa.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lqftvg6djram1435hdmpf11fuo/42960953022.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/40881667576.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/kepubuvit.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/o17tjgi34uli61mdq2kbl4u58m/besewubidufizegufejufo.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/belikebam.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/kotaginaburogi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf6ad30cc---jopopaselaminu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f8c579a98---dumezedipegobafesaj.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6uf0rb3m9qq4k3ckqq2lavkhj4/bogagapipeta.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lkmgg3nlveedgi7tfi3tv1jhb4/35184858978.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/76174553468.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd0dccbc8bff13eab4381e837aeddb1e/gotipitezor.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/69971842570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=adobe+acrobat+reader+rotate+pdfPDF 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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 18068 bytes
SHA-256: 40819d5bf5519a328fe1109c9bf39e4d3eb4148764e2672edce73ba6eb5ac83e
font_01_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 10324 bytes
SHA-256: c121f16ca1faa204de404ffb02a6b80be654edccce07508e265b523be776a86e
font_02_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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