Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e376560e2c169a2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 13:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fdf06c0bc9cd2fab3e64b178b2061f7b SHA-1: f7a6d2886301200efbceaa5755e5388649350f9b SHA-256: 5e376560e2c169a2c6650b0f23fa0ac811b3c1679e8078ee1634ecd4a33a49c2
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these links, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6328280064.pdf In PDF document text
    • https://acronimocostanzo.com/userfiles/file/4745851513.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/60736764923.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/rubipemufegaxusin.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/latut.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/dupigonetusexelifeparo.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/mazugodadepeni.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/43230677650.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/76757521546.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/rp0dssrcd153mvcb5fspv52qoc/23256777881.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/tofuluruzepazerawibo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db56c77de721845e845c907efdd9d638/78555235148.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/tugejonaralivotat.pdfIn PDF document text
    • http://qzgj.cn/upload/file/18560243222.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/95613265056.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/86547621127.pdfIn PDF document text
    • http://dd-eng.com/files/files/mipirewovepalu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fb00135299466fc3094ef3f6a0f1ee1f/85049577418.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/61282694071.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779c1171c52---rejupo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c60db6b160f---nawidewupugufidul.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/a10i6u0vvbbaj3cusmhpoc6hv6/wufabojusukaviguwol.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/tupejesugijorixubor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=glycolysis+questions+and+answers+pdfPDF 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_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 11100 bytes
SHA-256: b25cab6f2edfa60ea095482cb8e0f996181c529e7d4d4594d2d5527bfbd59886
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 18368 bytes
SHA-256: fd53d6bb3b55969ff655cb20bb34917cb36ab68d69eece62227f8c381676066e

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