Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c0fb3664c0cd74…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 11:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 152fec219a60b6ac2dc8d22b07897bc9 SHA-1: b6c2221ae69e730bad53505f27a6755374b14032 SHA-256: 11c0fb3664c0cd74fd6269dad2aea527a9dd81331118fbcdd9e5fb8b096c8c5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=dell+22+monitor+p2219h+manual PDF link annotation
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2oljs3v7m645263r4bjkv76pps/90360593845.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/xejapunogipelokofuzeres.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/sejewekovajirulu.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/21627508950.pdfIn PDF document text
    • http://laduses.nl/image/file/18695567925.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/51bf9197d7ce081dc833394ac32047d3/75517672393.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/78923248773.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/suxebewu.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/rokovonuxe.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081b714251d4---xunorotowiforubusu.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/boporujotovuw.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/37944539029.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/4060931269.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd4ad518e---xesozaxesujif.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c04cd804---75358585975.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/wobesupiwofasezusetoluz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/056373afe8257a0d1ea31d3a0cdf97e3/rikesiwap.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/topukobamik.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/38865533028.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/podugolazubogudakaxepi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089187cb2229---faxik.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vizogurilulemu.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/65929861602.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/s1i59hmkcfq9llt3shuvhtlenp/69879082358.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff32b064e---309692888.pdfIn PDF document text
    • 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_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 10792 bytes
SHA-256: bc204ac61a899908c1b81807f0d56ae70964766dbaca2936768fd16a92ee81c0
font_01_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 17640 bytes
SHA-256: 9ad996d59b2532a6005d105bf4efc8939fadbbf1bc2424b0d19b7a029f1b097d
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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