Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7099c4821700f94…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 00:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acdd6ca709fee9abdab1f74fa3c81c69 SHA-1: 51ac1f2dafced7a0cef455120b79140fe93261d2 SHA-256: b7099c4821700f94b91ee022b0cf6b455834162a09197c8c2a174f781b4efd45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to act as a lure, potentially for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://whkmradio.com/userfiles/file/81937088773.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/f6a65444d48ed4898fd2235535b628e1/41130826094.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/67498172505.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9a0df50748e9b9b1c20831113049f4c7/genozuminerofekane.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a544af4ddd3---75021837084.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ce8ba648---99096318931.pdf
    • http://flambotour.it/themes/userfiles//files/fuxadir.pdf
    • http://autoklej.pl/app/webroot/media/files/rinupegimozenerenetex.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/144514ea58610111df1d1751ce5a9347/19849162562.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1984726d96---jewaxopu.pdf
    • http://galluccifaibano.com/userfiles/file/62701813045.pdf
    • http://tz5168.com/uploadfile/image/2021/05/22/file/20210522_183222_181.pdf
    • https://rrr71.ru/upload_picture/3501195563.pdf
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/tesegajifukubetovavedi.pdf
    • http://ingenermarket.ru/userfiles/99930437846.pdf
    • http://rauvuonsach.net/images/uploads/files/73747429223.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610ccd661f58b---robodufirebuzififide.pdf
    • http://fszhenjia.com/upfolder/e/files/20210607183053.pdf
    • http://residenzaeden-albisola.com/userfiles/files/zidowanezibaludabig.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3fc6f15832cd2a5e1c809150766302dd/9125825655.pdf
    • http://mrspk.com/ckfinder/userfiles/files/11737503387.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=affiches+parisiennes+pdf
    • 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_off0000c853.bin
ee08c4617750133262d8cb47e627980da9f535b17dbace42fceb4c3734853570
pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 10436 bytes
font_01_sfnt_off0000dfe7.bin
6363035373cba58460e6fb5d32e808b7041e9fbfbf222db6932293eccb83a184
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 18864 bytes
font_02_sfnt_off00010fb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 16792 bytes