Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a7c493707cc5db…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 09:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29ffe0fbc865fd8f72bc53fe7d60d057 SHA-1: dac2af92e43fea5c18fdca9ae11b3a17d1314671 SHA-256: 62a7c493707cc5db030c3c367a0c1f777099882460fd6a85cb5465ba6dc14cff
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 and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://meesens.be/KrMee/Tekstverwerker/82720032137.pdf In PDF document text
    • https://ms02bet.com/contents//files/tuxadufisij.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/25925691442.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/pezaxapipo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14e4b05060---lawadimego.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/a0d2o1rhk87fe0uqvd1jggj6ft/50317746464.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ml9qfcrlek1kmk8lp15ogeofoi/68070550745.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/resalebemebun.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/89417422896.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210808/file/16284018153579.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090313eeb3c3---napoper.pdfIn PDF document text
    • http://lejonhund.com/upload/4853698431.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9916pi6vrkmq4iv3fk9uni37cd/95623352211.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/55275452878.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9206a097815926548af23088f319c59c/82557100429.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/32000173213.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210605042340.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/zudisixusag.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/16052276988.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/66c9e59d870a191667c9f1337d12957e/lawaromewomozebi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fd30ef17a56e4bdb744fbdb60340b226/31808825230.pdfIn PDF document text
    • https://artenika.pl/fck/file/78530011620.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/27bf75878c824a422fb133810c938ba5/taguguvesan.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3aa5bcbd3c3426899d997628a52705f3/gotutekexike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+big+thaw+game+guidePDF 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_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 16512 bytes
SHA-256: f80dd7fbfd99f6a84bc0498c0c37de46fd22d5b0dbe830a7b77003ad0be65c8c
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 10448 bytes
SHA-256: b94bb083a63f93f01f14162b3fb55cc6f398d1615e914b3c3150718eeec1175f
font_02_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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