Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f84ecda0bcb659…

MALICIOUS

PDF

70.1 KB Created: 2021-10-04 07:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e6bd797f83fd6ec90e1b4c96c31a9379 SHA-1: feea1e8041faeb3b1b3e521028a16984c4ab7c9f SHA-256: c7f84ecda0bcb6596f196b31c9f359746cf2b8e02c21b554d78f397e47b41137
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://classiccar-jp.com/js/upload/files/filapali.pdf In PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/15885722644.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49736313024.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/95849904835.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6f4700cd03dfffbee9eb9524fe4fa153/wuxarabiwedu.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/030532317554.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mbd18l8hkav33hj5ld02a8a3q0/womenuvurokir.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/gavorev.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/xofomujepabek.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/9f082a94e9d5dcf541fe4d00277649c9/rigiwanalukabavulafo.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/66252071611.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/zoxodisosupevixukener.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/gugiwikirerovupixoxig.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jowomeba.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/kuvamegusumopegukarofe.pdfIn PDF document text
    • https://digireg.se/upload/tixijuvoketiz.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/75410379486.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/birujibunun.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/febazamijozesuzilo.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/34332664378.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/79039521143.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/rutuvaferotajefelanawi.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20211001111012.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/radixoriromu.pdfIn PDF document text
    • http://ave-france.com/pics/files/nexiwitime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=margate+station+to+margate+beachPDF 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_off0000b3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 10764 bytes
SHA-256: 931a81c65f6729f4680bdd94cbb1c39fc385eae923eaf153b266506b2e5289d5
font_02_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 15064 bytes
SHA-256: 6c99cece33824a21bdb3740660e8d2732380fc4dbf004b48561eb15a59ddf958