Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72df9b8c8d80a33…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 08:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72a9e7854a3524da1dee138738b62b9d SHA-1: 965c3914c73eb2af48fdd0112f07a05bf5323f4b SHA-256: e72df9b8c8d80a334e212709d325676d11e2b08e4f8e522cf2e68276b863bff2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used to redirect users to phishing or malware-hosting pages. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external malicious content.

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=rss+push+notifications+android PDF link annotation
    • http://jamxmpharmatech.com/upload/files/41213397507.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/zebakinuzagixapegegit.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137532b4f8cc---punetewu.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/bawenujiluludomuxumaje.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/78719006005.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/mewumanuvobogaxepuratel.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210914183039_84pnt3.pdfIn PDF document text
    • http://darstin.com/userfiles/files/padoli.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/64461019763.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/rutenexavegajemo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ad9ff12ce1329d710d05fec921511798/xepemikerumivajuxoxa.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/22964944444.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/gunuwonomefivu.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/82005700915.pdfIn PDF document text
    • https://jck.ro/userfiles/file/51223098056.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/dajarasezalupum.pdfIn PDF document text
    • http://etre-belle.su/images/file/kogijurabadisidexo.pdfIn PDF document text
    • https://adikkedua.com/contents/files/31177805931.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/ramabamobovegisazajutuvuk.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/bexebajexeworadumexikom.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/62990817501.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/70fb03a258a9fceb618c196d779128f2/wapamixomalogenin.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/bamewexajegur.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/80530696529.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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 15420 bytes
SHA-256: c6a41c2aca5229a9636e75825951b263c21cc87db2019770cf12620a55c97631
font_01_sfnt_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10684 bytes
SHA-256: a33a13e958d243c9d78b0259433fd73a007f737074859692c8119f7ad9ec88b8

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