Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f7c166fa09d228…

MALICIOUS

PDF

84.8 KB Created: 2021-08-05 06:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9c3528dbc68722ff1114287bdb82cf7 SHA-1: 7a9b94f0f2f6f3b1725399bf8083c59161633610 SHA-256: f0f7c166fa09d228c7e4a23ecb9e23a0cc35b6a4475dbc464cc59fe97a2da59d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. These links likely serve to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9k7lreohflngmhljvcm3rcrne0/67232345656.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3ec4b11a---refosesidemimakekifog.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/41270921052.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5c5b621ced137990bdbdcafd30cba3b6/33531075864.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/pawomupetimafapenomu.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/teduzirezobaminetipipaju.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/23626459899.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/jipisebirumokunaroru.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29a7783061---dobetowe.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/iirkmkeh9cn2thhut80d4jli1r/lemukowurupimuditujutamik.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5c6c917c---56103048971.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/pubemafesukitozer.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/58690833686.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb34650ffc---56273420631.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/ginetevutoxivow.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f3a61e7f---40553902071.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a1b96dcc---9114729410.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/97690907829.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d8e5b29dbd0fac2d29d70ae88d73a9b9/mofizuwis.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/vobamegutafabepexavime.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/rokofilusadavezawivudire.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/jikag.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d168bc7dc---49227213793.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/72289650390.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/16842067016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+solve+for+p2+in+p1v1%2Ft1%3Dp2v2%2Ft2PDF 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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 17288 bytes
SHA-256: 7fcb764eb4a26a15cc94df33cd2fd286a9458cc664f842f3f53708f2cc1b8b4f
font_02_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 10584 bytes
SHA-256: 9f529437a9f1636065dcb717585026628e40b9d2fc4e1e8c9dc7732f050bb73a