Malicious PDF — malware analysis report

Static analysis result for SHA-256 882f391ca27e42a5…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 00:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e2c916ed8f22481f8289b4a98fa3730 SHA-1: 7f84fb2cbd26a50a3d9b7f93b34db7347036103e SHA-256: 882f391ca27e42a55d8cad1f2cb1fc4eec4593875c043452bc5209609145e4a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2866d4ea0---zaguvavizutikimak.pdf
    • http://mail-ex.net/userfiles/file/rimetodefasitizefuvezip.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4c9708a6---xexawuze.pdf
    • https://pristineleather.com/userfiles/file/71404132762.pdf
    • https://holocaustresearch.pl/nowy/photo/file/gumanavimuxuja.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ad96e7b6a15f9bdc2608a21dbcfb8eac/pawowapolu.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/df0ee2969ee9cbb94f9f6ab575edc1e1/64103178874.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/20178bb7fc2b042cf4eecf26744487cc/mabuxatu.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f299e6fbf---xelakorobu.pdf
    • http://heninrealty.com/userfiles/files/78526007680.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8tshckmoi3kqto3i3j9k96noh2/64983456332.pdf
    • https://bitree.ru/ckfinder/userfiles/files/tagekuzipunigimog.pdf
    • https://bandotrading.com/uploads/file/82687377839.pdf
    • http://industrialdevices.in/uploads/80361108747.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7012a924b5---56038136853.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/jjepb3ip50gruhn3jdh6me1ce7/ramula.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/tn8ffdpn4psn2leh8ngj3pj9t3/kizurovemobab.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b2a25886b---sidawusexoj.pdf
    • https://menu2uplus.com/images/file/79801487674.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c3d9cd01---tixowaruxejuz.pdf
    • http://stepasidemedical.com/images/uploads/file/59124782084.pdf
    • https://fallsplat.se/file/vujitosoxuwakowepurika.pdf
    • http://worldprint.su/userfiles/file/91019877097.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728585117de---702177221.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082533475dcc---lulerewifumoxil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+keep+cotton+from+shrinking
    • 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_off0000edb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16792 bytes
font_01_sfnt_off000105c9.bin
70b1c769af2ef8a15f14b105e7a02e5588f82249c12dde388217f1d989ff6606
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 16604 bytes
font_02_sfnt_off000130e2.bin
258d614af088b586b78416304b6c7654016f9d57960314dabba6a31f22c5f98f
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 10888 bytes