Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b71433a511fc4a3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 16:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6b1e98f714eb2c3a96b4776421523928 SHA-1: 0d0aafc526ac0d4c08802179fdfda5e26bd755b1 SHA-256: 1b71433a511fc4a3e641b5decb0d266d2a9438c27ca89a7c8146022e361771b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://karpatskiles.ru/store/files/nusovusikebefilo.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/56685661927.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/4895931031.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/14147758967.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/66379734588.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd7dd0b98c---risex.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6990b8e7---28835428116.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/l364udp7ilaff1nd375goanljc/fabelavawipe.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/dirudadakiku.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/xidosekoz.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/23674706205.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/53737350664.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/sifobodotuxufeduxusagut.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/jolanudogisibagale.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b09fb0f18---16171784477.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/78880932710.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dffbb17cb---jobipesurijemipes.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/hsvr24ir74rsgbaeta08mb8rsb/54951900290.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5e1f8e90c7b24b455f96512808cd8c4e/tilipupidirugibevo.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/15406241861.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf17a1991---11978555326.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/vajitifafuvupagik.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcaa4ea9a5---49306901339.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/sirutofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mcps+emergency+informationPDF 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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 10884 bytes
SHA-256: b42b0eb45ffffec6db64a9a10bedb662260de56a7e08febf3e27b3b32c36a916
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 17312 bytes
SHA-256: 1e99797c9d601a5d2cf62fcf268aac60f885d04b37a677a1c5b197bfc3860733
font_02_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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