Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe53af002ca74540…

MALICIOUS

PDF

85.9 KB Created: 2021-08-21 12:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 103431db8ae20c1ddf04cade19faafb4 SHA-1: bd1bb9137e1cb1020b9bb433f08f7b0856f5cf3b SHA-256: fe53af002ca74540184662aac01e2fed2f5ede4c2270f714c5e008d2adc68f2d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

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 http://japanbizkorea.com/userData/ebizro_board/file/4411109455.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e0814421---wugadokelelalixowa.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/6046b79574f430f192fc02692fb9afdb/61439121926.pdf
    • http://wxeina.com/userfiles/files/16394307277.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5ffa8214d78b4e99f48437386c15d8a8/suvoxuzatisekubowekozezij.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/cf11c33b1b1a2d4996140bd122a29e37/80848684662.pdf
    • https://tepihtrava.rs//files/wobuvafimif.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e29fa4cd6---57566195711.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160968c97e8431---nokedigufipediwase.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fodexopegezet.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7801f2b75---9749974880.pdf
    • http://bookblog.kr/data/file//files/54670921224.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/14728027185.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/rp2a9kmtmo90veke5cu13qq3nc/78305934512.pdf
    • https://searchkar.com/ci/userfiles/files/65107212099.pdf
    • http://childconnect.com/swi/fckfiles//file/82670310353.pdf
    • https://5udua.com/contents//files/65919812819.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/tvc3d6pccpks6g4g3u1na0gvd3/84913770256.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/676c234a6817c2edd390c0cfc0d131f3/lozedawoborazizarubevisep.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520103134179707.pdf
    • http://allnatureint.com/userfiles/file/8211165238.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/br41nroilm8urcqtlp30n9fme8/lipejapizukazaxapanuz.pdf
    • http://absigorta.come/file/95314445217.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+reset+zmodo+outdoor+camera
    • http://e1pl2.nazwa.pl/busy/fotki/file/95088749711.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee20.bin
b3b80e3bd5a778b3a9c911e88e111818a11c2ea8f4467ce19c421e98065b4bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16640 bytes
font_01_sfnt_off000118e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 16792 bytes
font_02_sfnt_off000130ff.bin
e485f541582a55680bb1c4e29bbf55c17538033542dace2d69371221b0c60404
pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 10524 bytes