Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e172155f9520fdd…

MALICIOUS

PDF

83.8 KB Created: 2021-07-16 01:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0896a044a6f00a298f42296643c6f34d SHA-1: a30e1c091a47b7db4cd7bdaf3d5a1bcc219c3a7f SHA-256: 7e172155f9520fdd333d5c309170372bf0acc5d942dfbd66ec3f4dd0104edc9c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure of link farms point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be611d9fc54---28171084922.pdf In PDF document text
    • https://glbtrader.com/userfiles/file/lujovafamebapolidejifasip.pdfIn PDF document text
    • http://zuche0551.com/upload/file/finofirobadu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41bd0ee312---57453554532.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/41596996514.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/48234775230.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2813aa1de28498a87c254288e86cd4a0/12096861372.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/bf3f297147b83878b4df5f8c96b2d51b/donakimerexamelo.pdfIn PDF document text
    • http://quatang3t.com/upload/files/karekewudijizilaxuku.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/46fa3ab264aac4d59da44f624a9722e5/difafop.pdfIn PDF document text
    • http://cjatkinson.com/userimages/48034666877.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3f54e1a3---27727792529.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160905c502be98---37356039736.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/babizozuzik.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/tigexiwuxekumodof.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/451fumkjp05ocfnbnseoonnv6o/momijexamipowugo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef1f1a73b---49541872755.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/09mslitc3uf2astidi574qsbn7/gazuzet.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48058071735.pdfIn PDF document text
    • https://bonacorsi.it/file/jevivinisunedoxit.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/2377441584.pdfIn PDF document text
    • http://linker-apps.com/files/jupadiropemomuv.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/86065123145.pdfIn PDF document text
    • https://masihpt1.com/contents//files/84360208146.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/28213044879.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a84bde01f---fuwojofokebopebu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c99af6de694---xotapiwafixubopajaj.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef8c90ad9---88495452766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=golang+int+to+int32PDF 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_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 17424 bytes
SHA-256: 7d1a25953b4ae2775c609a9c02eb21408ddb08a29c7971f0fed5eb3c026e42f1
font_01_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 10216 bytes
SHA-256: 18c17feae7e4abc24d6a04d627cd45cbf3a1446cd5262b32d232d7d5e6b97169

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