Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d650423f44cb26…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 10:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28847e4215524b5a33d8334794d34033 SHA-1: abcbcb10d3c33c49d915a1fb7df9ac8b9a967165 SHA-256: 27d650423f44cb26b32d9b3ed600f4c85941b178415ad6ac92f923005c3d09c5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classification and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs and the structure of the PDF suggest an attempt to direct users to compromised or malicious websites, likely for phishing or further malware delivery. The presence of numerous external URIs and links to disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://medvor.ru/uplcv?utm_term=cute+emoji+keyboard+for+android PDF link annotation
    • https://epponline.com/mentorfinancial/page_images/file/87745872493.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/10065032994.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/20382665254.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezam.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/22500010612.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/libewakomexanebovo.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/64899366708.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161387d367b5b9---96056738929.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/o3s02ldtob7e30kote09i2q2cu/pajubonija.pdfIn PDF document text
    • http://zatacorp.com/upload/files/66917602028.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/fefusujorazuxoxes.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/nemupoluteboruvefagiwogi.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409d4a4ec2---narumu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/43155169037.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/rotepufokewunofitabugubi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c203b3f399---81003119358.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/3153934345.pdfIn PDF document text
    • https://nada70.org/userfiles/file/jujedoxug.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/kepunuwezaxupuzujeribek.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/74857029053.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/xiwosubaruniliri.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/57473264607.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/85377783159.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/wotevajuginobafavufuvidu.pdfIn PDF document text
    • http://zzquansu.cn/d/files/65391930491.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/40659187697.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_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 16796 bytes
SHA-256: 04bee1e415b4664c427fcda7af24f7e7caa5e3778becd26d9c08ddf60677f1cc
font_02_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 10908 bytes
SHA-256: 490f511f2b6fc11340ba2bd9f522afadfeedf5aafcbbce9aa9095e4f196bc524

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