Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc8adb5c52a3d56…

MALICIOUS

PDF

81.4 KB Created: 2021-06-28 21:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b16f6a919a0dc0c2cdd9e1bef6857222 SHA-1: 84cd9458434588c4af0ce92962c9ec69a936994a SHA-256: 3fc8adb5c52a3d56094e80d2c5dd5aa414c83f322b60fa03b4873faa2a2b43e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.gabrielamaciel.net/images/content/file/rubunavobokakanejewavo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7p2nf90ig3hnp547jsc93031e4/wimasibitafafupefudifilen.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/sawusijobigikodovezasaxi.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fh39ngb9jbbq1irdgtad4ac9tp/nuzabibanoxujebivefum.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607593a08cde0---67811951118.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6477297a---71827537180.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c444c86e30---58741452822.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609479dfa4616---37769458452.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4656fa95c2---35170410519.pdf
    • http://mldinsaat.com/image/files/83284336803.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089e16a15232---36239558031.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/97g5r6o13casept6gqrhkfeq8h/rapibawabolebomukakipop.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/s5non9bb89vo9up9fe57mr50ps/78098959797.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l9prficnhi5695e9kiiecc26t2/kutudonejurono.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ecdcd453438fddec17be6f7842ff7891/7012504824.pdf
    • https://gangnampools.com/contents//files/levuwokodekato.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58555cc34---savejapazedaf.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ce5762288---49170653346.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/d52ouvr1ert6mbo64mp0jsn3n7/79436417159.pdf
    • https://alarrabnews.com/images/content/content/file/zojam.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/bf8ae2dccc188b51bdc1f566f900d8dd/jusoxesewenubuke.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/wulakopusosefinupupe.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4785dc017a---gijozidobewodaku.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608594746cafd---68426042140.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607808937d3b1---84793736491.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1fef4bcc4de36989f8faf8cf00763a46/23228256154.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=credit+score+510+out+of+710
    • 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_off0000db97.bin
82b290d44f83c7a30bc5f0def51fa1ba2783d4f3195206c912da916aa34457f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 16284 bytes
font_01_sfnt_off000105f5.bin
010b6c486d52ea591e0653bf2e10385deb1014104a984d456d4c91f1d4275ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 10644 bytes
font_02_sfnt_off00011e9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 16792 bytes

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