Malicious PDF — malware analysis report

Static analysis result for SHA-256 549a1b95e174b098…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 12:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e87b29d75660a6f282432b75989b24d9 SHA-1: e476d9e2eed2cda03a815740b74deb45bafc4c75 SHA-256: 549a1b95e174b09837619bd30984e52878069f702bcdf37ab7092827ad9422e8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=gta+vc+mobile PDF link annotation
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c5f3f36ebe3b10c7a934c31ec0b16b96/nuvamamuridow.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/73021210838.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/99000365300.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/53103b503bcca6c3befd00dc0b4564b8/29113179264.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/bofuxomaja.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/43053855145.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/rukoxozimoxe.pdfIn PDF document text
    • http://belovosushi.ru/files/57010230765.pdfIn PDF document text
    • http://allasclub.com/campannas/file/58218222344.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/womidexepas.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/lipiwosemugax.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/gigitom.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5e35de63---veleludelegewiwizetewanor.pdfIn PDF document text
    • https://funke.be/data/file/navonudupuxawe.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/xiwanunemijudelaxele.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/5226838664.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/revarutovuwupefa.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/80434939961.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613433526b124---8960171690.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/61880078060.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/dunijire.pdfIn PDF document text
    • http://thevalleytrader.com/files/rujebedilitelaxexenifo.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/3042795903.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/laluf.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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 15744 bytes
SHA-256: 1e5f9e8b2ced14cc1acebc62f6a285f0840b02f1b138250a165f0a2364c3c80f
font_01_sfnt_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 10264 bytes
SHA-256: f6fb435c0bc606dcf7de53dcf9fef57ef309ec86326d988ef27d3857f9a16f55
font_02_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1