Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eec03aec6b38777…

MALICIOUS

PDF

103.2 KB Created: 2021-08-01 17:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c53141255ecc4bb4f4853e473b73a223 SHA-1: 42aadf70f0e726e781f1716c2707cda6acc63d63 SHA-256: 0eec03aec6b38777327e75f72a7c2b364be30d706db23f462c999adbbc7dc766
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://benthanhsgfarm.com/images/uploads/files/ruzitigemosodusarijaxi.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872085d9bb0---mexuwipewobu.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/45777291547.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/dizefodobopefa.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/noremowufaxemulukoguxi.pdfIn PDF document text
    • http://amdind.com/userfiles/file/lijapif.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/16545488587.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/miranoreteboxoti.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/vuxur.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/jaguwuvof.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/sapif.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/bajewenevizoxixev.pdfIn PDF document text
    • http://garderoba.sk/images/_file/texelijonav.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bcff2874f---wexapejulibu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ua72u86qje3tbtus49lfvl6335/derabafe.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/809f193596db7dddefb587a4521eb070/perodutulufikej.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/31051359976.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/da7c704879bcce3ecbda70fdb9d9ed3e/15914704371.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/40220409150.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de511a5b0ab---2133956367.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/85127853036.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/qbkq38ot4091lu1bss2ejmtnpo/13588841470.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a161c347d545c506bd75648f96324699/55348605635.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/xopaxafu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091181200979---14573165348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+set+tide+on+g+shockPDF link annotation
    • https://medlineplus.gov/shock.htmlIn 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_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 10508 bytes
SHA-256: 4adaa9c5c7ace208706b019ab4af691cdd226506b20d499f6f0c9e0c923d2d34
font_01_sfnt_off000146e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E6 18688 bytes
SHA-256: 12feae1215315de5a2bd0a62227646ffb2e9e3d7e7befd9a0bd9c89e1133a8fa
font_02_sfnt_off00017708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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