Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad741e307b12d79…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 12:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4365aa181fb9c606faae8c9fe5d9a264 SHA-1: 132e4017b8db838553d9f75ac81d657afd6efaa1 SHA-256: 8ad741e307b12d793655b8425bc9ec275470a8e7839bcdfa55551ca490dbc770
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute phishing content or malware. The primary attack pattern involves luring users to click these links, potentially leading to credential theft or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=lg+oled65b7+user+manual PDF link annotation
    • http://slhs1958.com/clients/18590/File/jafepipomapavositani.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/809dbad9ab476fde8a084e1bfb5ec375/54350245860.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/gasebezugagifujaforusi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0803ec10---14772815723.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210818/files/20210818110046.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c111dad33c18d9b5ee843e76f9a28441/kexixigaxego.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/zubige.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/tobixivivug.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/80922017154.pdfIn PDF document text
    • http://araonline.hu/uploads/file/99476192983.pdfIn PDF document text
    • http://venkateshservices.com/uploads/28954630136.pdfIn PDF document text
    • https://ghnservizi.com/file/jizazogobogub.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01c0487d1---fakajedanu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/19321015620.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/julapawaneweti.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/lupuzuromumazerepegixigi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9affc4f798---tifowimukis.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf310938c68---wobovakekojigosoxerodap.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/7133973017.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc7bc7cc3c---devojutusi.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/gojukogivizoxazoro.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da9aff008f---nokosetimovabujobip.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720ea2d05ac---65893594564.pdfIn PDF document text
    • https://sambelteri.com/contents//files/59477995551.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_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 17364 bytes
SHA-256: 34912f845528b3a7cee272770c39a50a929ad58fc1b39bc2716998491f8c301c
font_02_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 10952 bytes
SHA-256: 11314bf67e1518e3fffda30b79c3d20d70ef3613368e18a16dd504be4dccb4ab