Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac437c86f8488eb…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 13:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d87b10c940ce2e0eb0c5d96eb9db3b0 SHA-1: 65a01f93ae4499a75c01bf3a84821aeb9df060f4 SHA-256: 9ac437c86f8488eb273202a1010da8de8a064179707efbfb3e03be7b630d3c39
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=france+vs+portugal+which+channel PDF link annotation
    • http://18554080.com/userfiles/file/60605795009.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/7948371349.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xodiwisonap.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/707ectobhedjo07ce99dri7rc2/13576322455.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/13342520470.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/66845765204.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613270d8a741e---lewojoreruf.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b28c34f1---xopegafelagikagolasumilel.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/risimopa.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/96418576474.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/86066641530.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/6db65c4eb6e60bd2b5673624fc4bed4a/sefudefesesokiwarazaxu.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/30098687606.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1826a085ecbab4a419ff226a30fd4802/93291449780.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/58966222839.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/nifasisijefiduvavilofo.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/ganebuxifado.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/dezinomelap.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/vuxopalamediwo.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/gebamagesegowokikawebaso.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/20205670059.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/31547261367.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ce7deb6f222acb9ada782ed502cd99e2/38906298484.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/fusamupejuguf.pdfIn PDF document text
    • http://isvpro.com/custom/files/40333836513.pdfIn PDF document text
    • https://hiroyoung.com/data/files/tazeligibimipajoxa.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_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 10880 bytes
SHA-256: f407fc584e24c8ba95e9eb0884e25f6ddec54e6813d0ed0bcb85067ee8fa2663
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 18552 bytes
SHA-256: fc408559b8b1382688fb361040f42f937361f6c8cb1af13142b70f54f63aa94a
font_02_sfnt_off000133c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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