Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ec13a4d5d47d17…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 03:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b7227184e7e17cc805823e0b11b291c SHA-1: e1487289cf3fdc1935e2a9eb3fdc3f5b95dd8831 SHA-256: f1ec13a4d5d47d17fa69d9c71934d25179e1c9af90957d3d36792871dfde7798
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, multiple heuristics indicate the presence of a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content or phishing lures. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/161d64acb3234d1a1a54e2e2907afd3e/83234530885.pdf In PDF document text
    • http://montagnobozzone.it/userfiles/files/58062712042.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/26191450610.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/mepefinitunelamek.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///37764595803.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/turabivowizamefoxubobili.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210901102242_OTMzNzgxNDQzMzY=.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/80663935594.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/20082491582.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9fcb437f---4933359187.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/tesumomo.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jikisumiko.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/timomexovajewokuliseko.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf438298c---65937122989.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f535171a---44382589071.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/tuzimidupifa.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/6249779005.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/6212751281.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210905223312.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/74752774592.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/bojetufi.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/tuxotikoxikigofa.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/87855130570.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/xavudafolavemiwibudabiwu.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/tesagesatixazaronaxuleg.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/84116939226.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/20940623186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fate+grand+order+android+apkPDF 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_off0000c174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC174 17176 bytes
SHA-256: fe43d434b50e5241101eb74693012a3a29a23c5ce3017afc95c7ff55fbc111d9
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 10424 bytes
SHA-256: cfa8667077c0f1d3d67b9381d42f2fc59ef055cf21414cc6152d4b5b794051f1