Malicious PDF — malware analysis report

Static analysis result for SHA-256 96874d6f58ad005e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 10:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09cb8b6d83be49f9de3e9ceb433e0dd6 SHA-1: 5a69b6b0784fb07188a2b9d997b124df71e894fe SHA-256: 96874d6f58ad005e6facd0a9c71251cbcfa5182cb68743a85e62574febf2dc24
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://foto-recepty.sk/images/fotky/berojubuzatela.pdf In PDF document text
    • http://2sisaccount.com/userfiles/files/gigapakofetawaf.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210908221729779206kljzxey4msau.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/wifutuzoxu.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/pusexajuxetopamebef.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fef3cf78ca5bd70d1a157d36b7323277/zuwif.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903072137784964.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/86687209864.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/70467313747.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/vagumapukadaxatipibatuvul.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/41690393272.pdfIn PDF document text
    • https://purefeeling8.com/data/file/59531398677.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ba85eaac---62732161103.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/38329405444.pdfIn PDF document text
    • http://rc-modeller.se/images/file///towejafovuraxadigan.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353498677a7---sixajapemarozizige.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2750702629.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/13129172244.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/89796587122.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/kezobami.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/35184457330.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612f395182c85---10576423738.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/24964761353.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/72888874481.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/7099088723.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/nefisizawa.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/lorim.pdfIn PDF document text
    • http://sinoorchids.com/image/file/gezas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=real+steel+boxing+hack+apkPDF 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_off0000d065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD065 10932 bytes
SHA-256: 1b07c054a9919f7395191640c4a45bf763559a60917b08489ae19aa4c9533035
font_01_sfnt_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 18588 bytes
SHA-256: 6cc58182eb86fbfb358b11bacef2949fa6936817f13e8f2b0165d101d221f9d5
font_02_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1