Malicious PDF — malware analysis report

Static analysis result for SHA-256 6038ddbb0503ed5a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 12:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0e098d3830529d4a20fd3db02898957 SHA-1: 2042b14cb0d1359ff821d221068084b5e9a00252 SHA-256: 6038ddbb0503ed5a81a025baa515fcd4c0c5dec7db5919c4253fabd254c1dbb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=hotstar+free+subscription+apk+download PDF link annotation
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9184948339.pdfIn PDF document text
    • http://iphysiology.ru/upload/ritej.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/46631532378.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d511016ccd40ae33212e7b29c15791f6/45217556898.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/74397231730.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/70712145774.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/42079982713.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/66778339683.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/pedatugokidike.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bilebexesez.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/40426107288.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/63378832734.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/waramexozex.pdfIn PDF document text
    • http://iucecb.com/files/file/gakonipoxurepojatanolume.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef77a9acc3---55525459016.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210911_185846.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/84232900016.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/cd9c7c9e8c5157f1eb8699a613cbcd42/rexesofejavabaxuzu.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/48636414257.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/10320339429.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/24180712539.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/32847333560.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d982e230a9---92389774922.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_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 17416 bytes
SHA-256: d7480965b5f8cc1522de590fbe32ffae8f005fab3790cceb7cb51bbc56476784
font_01_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 11024 bytes
SHA-256: fc57ac7de60f9458ed808508468424b700423937ab75840426a5cef329dbd60b