Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b9bb6b6be2bf59…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 06:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edc7d05675deb1b16647433e760b0993 SHA-1: ebea32f3e970f3dad9e8c29d344d77398114ef53 SHA-256: a2b9bb6b6be2bf59590c5fe129ac80c27616cc94c5b01763210f43b58af8b76a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. This suggests the PDF is designed to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/59mglf8f9sarmvkbh293tkaj96/luzipenu.pdf
    • https://dollarplus98.com/images/upload/files/44106978883.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091c598f2c21---87612958131.pdf
    • http://newgatedesign.com/Images_upload/files/lekujelixuwaz.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3ce8a55327---13308921290.pdf
    • https://masini-de-ambalat.ro/images/userfiles/56817088918.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917226bafdf---13515908568.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8be25644c---mofakiwixazesefelumu.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/gnstpccbq9plctpj6vnb6aa6i7/15492967569.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/i6cahakqgccus50gl6f1g93cki/31796591939.pdf
    • http://mikomisushiwc.com/uploads/files/41334339424.pdf
    • https://scavilecis.it/userfiles/file/27790691469.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3bcd72d746d16b405fd096319fadfee3/19107684645.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a29f3989d74d70cf04230af4793c6949/44260862598.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e81092361444d8d81a61414ec395840e/56322603902.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ce688b882---rumeze.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d29e18af20---8183953891.pdf
    • https://sieuthimaytinhcu.vn/upload/files/buzas.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9da295601---kokazikonuwabigevakes.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6up9ff766dfhumpbmto4gcp6ns/notukivefin.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fdd4b91038ad7cbfb0ae6b97601ae849/75278052995.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9b36d21b7f97a0c36e5b07a72107143c/pepolisurixudu.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b20b3f1e0---mejonenivenunuleribob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dihybrid+cross+images
    • 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_off0000f4de.bin
69e42ff502f8315607f084a9808c4ee3cacf1111d911b95e20bd987ff0f71da4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 10824 bytes
font_01_sfnt_off00010d9b.bin
22e0100ea4964c454ad79ef3f4aed1b34488fcb43c597888cee398a56999c696
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 19520 bytes
font_02_sfnt_off00013f64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 16792 bytes