Malicious PDF — malware analysis report

Static analysis result for SHA-256 5745a50b8a5992f3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 04:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90230e16587d0f9e76ea14cfee5e636a SHA-1: a84b3f4267a10a08b1332a23aac437f596deed99 SHA-256: 5745a50b8a5992f348e6da00b5e11d920d580855a61a85b1bec007375ab0d9ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the PDF is a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=rewinding+motor+pdf PDF link annotation
    • http://re-view.online/fckFiles/file/94300979209.pdfIn PDF document text
    • https://people11people.gr/uploads/File/ripaxikufabalovopuselowu.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/zanomajesu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7fb2015d---31642915649.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bc27ac52---maxagizizevurirego.pdfIn PDF document text
    • http://fructusartis.com/i/File/29126474219.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e517b68da24.pdfIn PDF document text
    • https://htchninc.com/d/files/93662480787.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/o9k9ri6fp4ks1lm3e74psfrub2/pijom.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/bujuwemoreberavozupi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096819175ef4---nibojisekaviwobefeja.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/vofexa.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/misajopipuxuno.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/pajuwapopefusanetegujeku.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4d4b26142a6036a1eaf81ab3110ab70f/tifaguvar.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/45671395753.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ecab02cd7---xazolulatutinosesasi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af4aa56c4d---45802383529.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/49175579333.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/31581134172.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/sugifumozefuvepar.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/80455019284.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7e4374754---sinuzogemesuxogixa.pdfIn PDF document text
    • https://4appsoftware.it/file/16966137644.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_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 18144 bytes
SHA-256: ca3ce3878e52eb6eeb1232ce1b32dea630e8f0fca57a9b825eeaca2ff211f85f
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 10596 bytes
SHA-256: 47fd1db248e80cc6efcfc5a2b9d081401d5690d8bb02fe5faea9c60de75cbbf4

Open this report in the interactive analyzer, or submit your own file for analysis.