Malicious PDF — malware analysis report

Static analysis result for SHA-256 6507501972e0f5a8…

MALICIOUS

PDF

93.1 KB Created: 2021-07-05 16:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9f376f528ed53466f8d9cbbfd9293be SHA-1: 1d3e2b364c74e55d6bb1751caca10936315a7f08 SHA-256: 6507501972e0f5a8dfe11f506b03c7e79fb975158d993f7e293bf9a6f5ee3223
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. These links are likely used to lure victims to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160778f7211401---najojatitisupo.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609df376219b4---92779091997.pdf
    • https://powermailer.in/userfiles/file/49587223718.pdf
    • http://sivam.pl/files/file/lopufotaxonibikuzi.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/fatamupul.pdf
    • http://auto-spec.ca/fck/file/roditolujaxub.pdf
    • https://irrisyst.eu/files/file/vixerepavitemetov.pdf
    • https://woodfur.in/userfiles/file/kadalozadobupuvovinubi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609794201e178---fumefobalolobeveg.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20618dc90---32982122762.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16081939404145---34937941546.pdf
    • http://temple.mo/userfiles/file/67912573886.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160717904145e3---xojujedowarakuwu.pdf
    • http://www.minaakshimajumdar.com/fckimages/file/6080675804.pdf
    • http://goodwill.pl/userfiles/file/40338013705.pdf
    • https://dentalrud.com/userfiles/file/54861652957.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fhg4n9pluef0umpaksaqmsu45i/nedorotimotuvos.pdf
    • http://japan-railpass.info/images/blog//file/suzap.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34f3053db---71000000880.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad4114654---ginemaremalosojol.pdf
    • https://charterfori.ir/basefile/charterforiir/files/firojuvebebejenu.pdf
    • https://yesilkoyluleriz.biz/resimler/files/11269102411.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4816d610116dee0871879f88c8381961/56510080845.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0165bfdcf28bda3b9f55125e169fde8d/66637621117.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=physics+sample+paper+class+12+cbse+with+solution+pdf+2019
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a5.bin
932f07a68b0f7e8354b8afa5d4914c235a32224498c15574ddf872d60265154a
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 11788 bytes
font_01_sfnt_off00011e92.bin
6f93651f90c3bc72c944e23308dbe6c5eca1a5490cba26d8a101bec40f0779f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 18520 bytes
font_02_sfnt_off00014ea4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA4 16792 bytes