Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f171b9dedf24097…

MALICIOUS

PDF

120.7 KB Created: 2021-07-03 11:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 77fd4ad4bf36518c858414ec743026bc SHA-1: c9bb5df69ba812db713044b0424b52877546d15a SHA-256: 8f171b9dedf2409732b2bb50a61a6834f73272b5e54ab16703ec605c3af0b3ed
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=average+calorie+intake+for+a+16+year+old+female PDF link annotation
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nrhsl97rtjff4udv5j98vdpcc5/11055809848.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d32e2efa---40070675509.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1766fcb390a7e8e83f5f4d85b33b1bc3/55981662719.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073918fd5bad---88749003984.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a8d11e7481069146186f6a1c281bd0a2/lalifakezig.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ut35atg068nnmmh47omobu4vlh/47608935054.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ffd56b27044ce07036fd80a469c4ff65/jezidasataletuzojojalex.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/3046286948.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/33785dbdb6dd54e853f494e7d89f4d60/woxalidif.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/xodopulizemunenitazen.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/2449752688.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f84f98b40dbd7049f3726d85364b900b/32458691630.pdfIn PDF document text
    • http://renknh.com/ckupload/files/55755026845.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/16273153754.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0cd6d5704f4a36d20d88aa4c80bc29f6/robopofudugajikepife.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/248f79972bde8388147ecc05b354ed8f/felip.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/87014017444.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aae749e934b---98036136184.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/94fbae1d88bd8967270c58c0f9e4ebce/tuwuruxofevakowegijari.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/lutodebanikatuwigox.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cda0a55b4---41527746783.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/88611415801.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/39080151406.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/roxamijekofofolazok.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4c322dd0254750b45eebc09221c9dc7c/40836931573.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/10474597342.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/148ce9a36b34e30b535279cf56106271/53893865725.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_off00017360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B77 11124 bytes
SHA-256: d5f53a583ad1bc8a1f87477f051e8eb03a7a91d0aff19790ca4dbaa82c62335b
font_02_sfnt_off0001a552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A552 18316 bytes
SHA-256: 6c1b458b7624f8d0324f0666e0f766f4004b1b2bd242316c38bad20cd52f4024