Malicious PDF — malware analysis report

Static analysis result for SHA-256 2317ad71b059e81e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 15:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f60f4e095f935084cd9715f566968f24 SHA-1: b6ce04aafe97232faf50edb893b33570e288b607 SHA-256: 2317ad71b059e81eace903499e74fa0379d132a5ef2c2593811c1fa2bfb5b205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple unknown URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://evrokomplekt.ru/userfiles/file/dixamoxo.pdf In PDF document text
    • http://yung-shun.com/userfiles/file/mapenemivenofureroxun.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/70028187024.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/tixeremujumolepewelas.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gekenaxek.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/fuzulutirimotawar.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/famokozilulomu.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/78763031774.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/09/gepafewijusin.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045814db31---22947410888.pdfIn PDF document text
    • http://klpa.net/userData/board/file/22858391380.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7df8e0917---laxeberivoxixokisa.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/pasibit.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/28457110255.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///66922949358.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/gemilizorowuwamedivujodol.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/47820069890.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/14538988806.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382e7aceb0c---sozonekufawefekis.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631570385belebuwizexigama.pdfIn PDF document text
    • http://abwessex.com/uploads/files/tirugavuximizupunofap.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/27218975608.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/11380644475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hacer+tonos+para+androidPDF 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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 17868 bytes
SHA-256: 2efe03bd4d4f268a1fafe27c9c53efb07bc1b6ec129b58261a97023dcf48ede0
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 10452 bytes
SHA-256: d332c0bb6f2064cf6423f4f9334e741a914d3bd4f6cf8b2cfdcb645fa0d573e9