Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd9f0b54537ba93…

MALICIOUS

PDF

90.7 KB Created: 2021-06-27 10:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd21118e1c90c4ee83522f9bc9104732 SHA-1: 38c5f4aff5c52c7d0be641b532e4e4389eb84463 SHA-256: ddd9f0b54537ba938f4bce0843ab3e5bc497867699b7adbf0ca791777c8267aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd3066a5b8---jujodipede.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc07ca5f9c---jewilirakekutax.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ec75e8a1395061e556262096fc172b0c/pumogezati.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e905b46f9---gewulelosokipuxi.pdf
    • https://alutat.com/data/file/33151878993.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/boropiraropalaselovofa.pdf
    • http://feynburg-uhren.de/uploads/ferevuladi.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7c7225161a6b6eda3629692fe7d11162/govizadobolajagazob.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ddc2ed47---petukijojovuvezutetaxadur.pdf
    • http://musorcentrum.hu/files/article/file/28478047158.pdf
    • http://tantos.jp/js/upload/files/jodalutoxunerinolajo.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb4f3f581---78309819524.pdf
    • http://langfordfinancialservices.com/userfiles/files/34180813657.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/469241119ed1c038f982c1b399694a6f/36714659214.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/dfa2c28f011c9c2c75345fbea13f1329/2927166120.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/fekudilofurebo.pdf
    • http://christschoolblr.in/userfiles/file/julededagajozovumepu.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b64af36b5---27920749326.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e91dede307dd67b6337cf322fbf1a55a/82176884988.pdf
    • http://remont-elektro.eu/archiv/file/gixusanugevolajigerugu.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/44095547781.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qlcq3agtl7ocom9mummn7oprh4/57027512193.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3fc0cbabc---kazizutuwuzazemoze.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6ee39f5e20ef87d411ff5a19f7462fd0/wuvoviligililosatujuzabuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+screen+record+on+snapchat+without+them+knowing+android
    • 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_off0000fbb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 16792 bytes
font_01_sfnt_off000113cb.bin
7e04b1c4afcbd2eacdd7c0431664db5874ca2ec8cfc233505d93edd89c5591ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 17404 bytes
font_02_sfnt_off00014175.bin
e4d163c9461396b443baa6e6dd748d74902f9259a19cc29de6a875b96b26d959
pdf-font-stream PDF embedded font (sfnt) at offset 0x14175 11184 bytes