Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e1b538f2ef8d42…

MALICIOUS

PDF

85.5 KB Created: 2021-07-22 03:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4cf3abbd5d3695e73ccea3e825406d6e SHA-1: 88d77c67e693cedac82098bd04d11e68d723cbb4 SHA-256: d8e1b538f2ef8d42ec6b433dd089915f7c1bb0a2044139ff5883ad653f299e6b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608746722bc92---zekukara.pdf In PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210620_440DB279138129EB.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/kikikinoduxuwisokajule.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851dbc83876---97082396356.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609663dcaca44---57295212478.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f36e08472---71451263667.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/58818180839.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef59fd0ca245aac15aa4e32d107692e8/gezovesim.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609602e52bd70---wadusimafatinumonajis.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/87391244528.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/98965372658.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/93550640885.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/p9rannol0gru7ktf4f98fpvut4/lowenizezarupi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160910cfc413b3---ribizixikakevilafonoz.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ded8124514e8a148be9ae7b5b4c7fc0b/77719192480.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/68724249700.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/l440ap72nkdrijd89poogvjmnv/99097313857.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/38053852209.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/21550497143.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/katoxipur.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/linizezenaxuxidebasozonak.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/xorejupug.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/vanuwuje.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaf0fea7e1---wezemem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=beyond+the+power+of+the+subconscious+mind+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_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 11172 bytes
SHA-256: b2251a7841fd90e2487517a83c60d8138a041966695628c5caa68e3d0679e4d4
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 16428 bytes
SHA-256: d320eb28f8c797338b71d646c6c1480779942336a88de2d39f5369b3a1f747f1