Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff4fc27d37f9354…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 14:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d24448702c03a338f4e35a33ccd336d SHA-1: 65830ac4136e2b74d78f152c57bb6ef477a78bc0 SHA-256: 3ff4fc27d37f9354475a8ac937f626413fb49603292f1c7ab2bcb74e069fec57
204 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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://catamma.ru/uplcv?utm_term=how+to+see+blocked+numbers+on+android PDF link annotation
    • http://pitin-akutsu.com/js/upload/files/xemiponiferekivafifizugo.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/zitufenovixuloduguji.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/57898344122.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/84610909987.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7a69e7fd916c303859fc921b15eb066f/gasolivenofe.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/gafib.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8842a0cd---94972190085.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/bekezutetive.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/45136565559.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/vasixi.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/vaxilaxaxawasupifafimib.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/99526005001.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/peluremoza.pdfIn macro / runtime command snippet
    • http://geostudio.eu/userfiles/files/tidizobivitowinepezawalod.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/jinifun.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/mekuzimexabazigid.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/16114242357.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/febeji.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bed3c244a71624875500d33b2df80fe2/20525842985.pdfIn PDF document text
    • http://telecycling.org/files/file/60516501368.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/b6ace623079bfc9b78895f0bdd0a4f8a/pikawazutalixotunola.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/64200195813.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/def612450d41ae9b526096ac4b8ee2b4/40939468651.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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10940 bytes
SHA-256: 74f60ef8f6bbf7bd158ea569e06f75a282d18e8850df9978424e2c49839db9d2
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 18212 bytes
SHA-256: 3c663b3132d70fd5a45ed1a0b49a16c6ced1580a5c0442d38dd12b024ff09003

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