Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c1bff0c96a3bd7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 11:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d66d80ae9e3590b00c169df3af71cb23 SHA-1: 4adc48f57472b0468c0e1c6cb8d46328224ae1ff SHA-256: 75c1bff0c96a3bd78899e12a9226d5a5dd28d60aa7babeabff24d75e903c32e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the final destination and potentially track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=lp+ikterus+neonatorum+pdf PDF link annotation
    • http://php-lounge.de/userfiles/file/4675327580.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/29171680810.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/15723643791.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d782413d---fuxuzuvu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf7b43021---solax.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/59349499000.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/30964144820.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/49496063013.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f62714a19---dadosajataxen.pdfIn PDF document text
    • https://estoniapools.com/contents//files/pupoxiweg.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d6526069---69451789170.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/4qtcksnfhlr37iccig5baa7rqi/namojaxitowanisatizirezem.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/t7gb1ahttcebh66abp84m48isp/letiriz.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/60813591808.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/87607467043.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbfb7c060---tekivaniged.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/21811107499.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608742a91f6f1---pinudusekidow.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuzutaxawij.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/tqo3hlkiii9219s64lvntoi7f1/59944473661.pdfIn PDF document text
    • https://avenue102.com/uploads/file/51997710991.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/47230419996.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8ece44572810aada3f3a7374879ca319/nefexukuputavolelus.pdfIn PDF document text
    • http://saaretravel.ee/images/file/lutefonowedozusegedodi.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/kixekolupivavux.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_off0000bb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5E 10760 bytes
SHA-256: 660b3a98a55db45f82658706710aa9f53c9206f749e5b4c3787e7da5f93d7c24
font_01_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 18676 bytes
SHA-256: 0870332c084ff986c9dc2cbd9379874b178ea6624325d9b15b1c9db1eb1ca77b

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