Malicious PDF — malware analysis report

Static analysis result for SHA-256 518381c8813598c0…

MALICIOUS

PDF

95.1 KB Created: 2021-09-07 15:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0eed6097dbd21d9abe8a4343b2d015fd SHA-1: 69c40bcc03a8e1a4f7b12e1ac4262e5163a30f10 SHA-256: 518381c8813598c0092bfc1718c233818275dbb81bbcadfb299209e2a80146c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://affectif.ro/data/Image/file/21112802042.pdf In PDF document text
    • http://turagent007.ru/userfiles/file/nopexipakuxi.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/ruzelebafuriletazaguk.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/99032671351.pdfIn PDF document text
    • http://azizolace.cz/images/file/6198132943.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/tg97pod9q1c41qfetamg8bac54/zusomiwenepemo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8385ad463---77339502538.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210730034914.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610441c184105---fexuputizesuw.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a6ccc3aab85fb092aadc7830bde117ed/jerarume.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/gigufuxeso.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/mdp1rudibqukr7pql642n7sgu1/96077013732.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae005d85b6c---tirugapavuziruba.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/sageposofuxixeva.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/38875035297.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/30138100234.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad1e84724---pixuguvavijegi.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/32027320540.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/36024637602.pdfIn PDF document text
    • https://autoskola-scp.com/files/xipijozulozazupinimanus.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/28846604685.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/u27j770th6egdsm6mmquj93ho1/84169387908.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c3f65232a---somupesunuta.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/91299225413.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/keluraxiterebadoxurenukow.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/35536180392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=maquina+de+costura+manual+singer+como+usarPDF 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_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 21368 bytes
SHA-256: 679f9ab9358d0fb044e81f1fa8273fb63e9aa6fe68f169ef41f35b71bdedcbb0
font_01_sfnt_off00013b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9E 10952 bytes
SHA-256: 097e2d843e3ac114e9cab61941eebb5e415e15211dbd43170c0ef28169b79413
font_02_sfnt_off00015478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1