Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b176b815d262ce…

MALICIOUS

PDF

82.0 KB Created: 2021-08-30 17:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79fe17e199ece187a175ebd79e1f831d SHA-1: 36be42ba1ea257ef2b526acb309d0b337fae6365 SHA-256: b2b176b815d262ceadcbf1095d87dff0b5c0ac3b2bf311e4ad617dd0a2599a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kojeneckezbozi.eu/userfiles/file/31384027159.pdf In PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/97401164844.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160f630351b076---xeremaropew.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24d02825fe---79932138001.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/gusetarikekenitadosaf.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050117242132.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/nowurexuwixamezotu.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86043295722.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/36488640183.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160942d8be3dcd---99098806661.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd0a53f8f---94466392835.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gigasituletagozadogelavok.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096f57ba05b9---33816249098.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd8107435---fodevawabejukumon.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/39782583422.pdfIn PDF document text
    • http://atomleasing.ru/media/File/23657911548.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/murepironipelunifu.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/57659388418.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/xinakigigajukipowozax.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/97756635339.pdfIn PDF document text
    • http://turatabor.hu/media/zogimixogidijutekov.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/bevemegidedibisurowufe.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1fc820f3---30131310184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ms+solitaire+collectionPDF 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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 18236 bytes
SHA-256: caa9ef4243c673a0ca3d3a22f18b3e3033a2b6a7cf40e3945d13681db5e1e5d4
font_02_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 10216 bytes
SHA-256: 9421020a80f6eef58424dbb3512115cb120a4345d2cbcdebe14301662faf9e03

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