Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa2976f0238b02d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-24 01:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45a76629f1274f7603e914dad6badcab SHA-1: 9ce823446f5ed0e64bfbac9f563192f0cdbd170e SHA-256: dfa2976f0238b02dab746e6ec4405cb1bba72023a4b80045c35285005c9619ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fogathajtohirek.hu/fckfiles/file/91054216324.pdf In PDF document text
    • http://altiro.nl/home/tjerk/file/desezakafutugabegaka.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/78078312359.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/tonukadi.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/dozakidawutotodasiberil.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330437a1a40---nebipodamebefezorarojif.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/67782037461.pdfIn PDF document text
    • http://juncheng.tw/upload/files/gutafobebobemovat.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/fawabozusuk.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/dojumokelapiseji.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/53678769012.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/xurevad.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/boximojodigugafazutupaxi.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/kobitukerer.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914052110841975.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/52945202439.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/bedaxolurimipulesapa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bucfhbgdrd9bj8dbq8jhulj2is/purazokutof.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/2734891167.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/kofadudopukozafoxofuki.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/70c66c875298eb7c01752488eed0537e/79320520538.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/77016551749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=goodness+of+god+lyrics+by+cece+winansPDF 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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 18016 bytes
SHA-256: 279c3761a6fb99e2082de68689a76d241bb63bcf4c75d62c2626a31681081db9
font_01_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 10932 bytes
SHA-256: 599145c57756a078bf77e75818bc9f67b84e16f9e739cd71d8e3c2eed44e2691