Malicious PDF — malware analysis report

Static analysis result for SHA-256 b184a0a0c20f8e97…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 11:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3436c1b9354a83612653273ffe3e1ad SHA-1: 282f98d99f00a9f407e5d636da81a9b662193c6f SHA-256: b184a0a0c20f8e975ad25727e795b4029de09908beb0bf61435a62b2e8a1ff29
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The presence of numerous links to external websites, many of which are hosted on disposable or compromised domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fasson.vip/images/editor/files/bejigafusegapifexu.pdf In PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/bevuw.pdfIn PDF document text
    • https://cubic.is/userfiles/file/44195920722.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/19978159731.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/67427374833.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/62586000630.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f476b0c4c194677910da08e7fd5af74e/jupulajebibozituvu.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/84687701923.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/81475519755.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc38b10d0---50377570984.pdfIn PDF document text
    • http://turatabor.hu/media/daxezijevaxazebibo.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/wovotixazopavapo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed0aa943d---kilitozejokovamudetun.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/50jqqpf7nk51n2eld3d05oom85/97879901995.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/sulute.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/38928375730.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/55770438861.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/suzeribiwetifas.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/7573554900.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/xibizufaborup.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/tisafuwaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3da63dabd---34866871175.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/mkjcr9rc14881eooci7h7ecasc/zezusu.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/38025102376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gottfried+bammes+complete+guide+to+life+drawing+pdfPDF 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_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 11328 bytes
SHA-256: ba1e14a3846e2bf7a3cf299e880a0a4d7318b7748c656ee8334b6567f75ec73c
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 16912 bytes
SHA-256: e30d510195e94a5d1b8880c50662d1705344d13092acc439c836a0b9549b5b6c

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