Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fe231117188c23…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 04:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20561b9e8380085c9b323aef36cdde3d SHA-1: ee0328cb08c10bd5e853a43093010683b276fbe4 SHA-256: a2fe231117188c2375e074b10fdd823c912a6c9c84c5eaf7bb3866586bd5a206
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://archism.ru/uplcv?utm_term=jcaho+questions+and+answers+for+nurses PDF link annotation
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/2f258374a132e06f1f5ef9c65a55aeb8/49971902274.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/24879169820.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e2260b19---27923392774.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/riguwu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072dac6b135e---57542667897.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/judotanelajode.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a721d697dc4---11722359946.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6742a4aebc61eaf7d21893693abb99a5/rebarezekepitoz.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828fa8923e4---tuveriwemejuwufuvetagu.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53459688245.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076147d6743d---pajimopemip.pdfIn PDF document text
    • https://amblamy.ee/upload/file/galirojudazamunoduwesabep.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa3d4dd82b---9706289454.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6661035c40---rotidujoxerelu.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/nekokewotirirotog.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1afb7a99fc---dazatibaparaledov.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2a6e398de586c5a7a2def52df29c47bb/juminil.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76f83d823c---27394850311.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/rewatafar.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/kuwedelematut.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/96000098061.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bacpjpfhl99u2n2vfqviqpo8g0/tuxezurodugajiz.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/17854369678.pdfIn 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_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 17792 bytes
SHA-256: 1db023ec85414077121e373efc3ae2b9a00c6d2fac46892dea71b811dd9f9b37
font_01_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 10852 bytes
SHA-256: 71ba129d7836911e3cd09f46c3e5e96434e64ebc92ec77565ffe2a2472dda7a3
font_02_sfnt_off000138e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1