Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a46f6c1c6b00a1a…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 18:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b11bd99d9ba197cf1f5d9070e60239e SHA-1: 64674fd510ab9ea1c8bd4cac519c63b78179716f SHA-256: 8a46f6c1c6b00a1a809622925c76399696cff2e70fe6a115c8181ac949486207
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e9461175---dupozodipunowipusufabuv.pdf In PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/faxogaporesuziluf.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/52998690800.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/sinagodenebuvokufomu.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/41658757692.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/kezude.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/21m0df3ph0hkqik9f11rfhj878/37048314605.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/lefet.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060302583863.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/20848d9746dab65492052b3878cd1f65/rijodofodetugupik.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/wusevokila.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/4097806814.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/wuxofuxixadutagimusezazil.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/xakinelavudipoda.pdfIn PDF document text
    • https://melz-feu.ru/upload/jalat.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5haj4puqku6m3tjjge1jr910gn/vezubagotodiseta.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5fc6c496---kemirinakefewusefudiv.pdfIn PDF document text
    • https://areicon.com/images/file/57579454923.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5lc4jsllj8qgt36u80dv1b8s9q/jukifita.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee183dd706c---38498362554.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e3037d3956692808733e5040b4ae567d/43394208289.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/limesazetixonagevunibad.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160870b42ad4c4---gupojirapikaza.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088d2112def7---wedajujixopukova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tecnica+de+colocacion+de+sonda+endopleural+pdfPDF 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_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 20588 bytes
SHA-256: 51e9a7c7c69be1b05c088d1a3184f2b9ff6d357c7e422be957dfb6d0a81d7af8
font_01_sfnt_off0001309b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 10580 bytes
SHA-256: 95de8c8955ad52d0c7a5e5bf2cb4f977a49fd9418b7111e94040a3176ee1b0d6
font_02_sfnt_off000148d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1