Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1ede471abf0339…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 22:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d36417b41a517b313a2c895c3ca5d05b SHA-1: b10f32980ddda6dfce33ab2980258a8f11af7f72 SHA-256: 3e1ede471abf0339535481a64c4559d210361f4138aa7b44e4d85df42f231091
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites and disposable hosting. This suggests the document is designed to lure users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=breath+of+the+wild+mp3
    • http://okuninka-biale.pl/userfiles/file/tasixudugikinazidoxos.pdf
    • https://gsacademy.ge/uploads/files/zogubututigorotepimizopog.pdf
    • http://studiotecnicoprato.eu/userfiles/files/4567684309.pdf
    • http://www.golfusa.be/userfiles/files/jeberiwategimavopumekivi.pdf
    • https://laughteronlineuniversity.com/images/upload/files/wizunevesipakifimeregadu.pdf
    • http://cortocircuito.trialpanel.com/images/Upload/files/82026783506.pdf
    • http://pxmonastery.org/CKEdit/upload/files/19109911215.pdf
    • https://tepihtrava.rs/files/25875456517.pdf
    • http://pizzeriagiganti.ro/imagini_ws/45204954949.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161426bb110f8b---gururilelukulopab.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/8675fc43533e6165fc03bb5fb9a85464/pumiguz.pdf
    • http://strandedtattoo.info/file/25655293902.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210907063043.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f676110d0---jigiwavofapi.pdf
    • https://www.sacict.or.th/ckfinder/userfiles/files/kexodosebarodazuvaroje.pdf
    • http://hoangnamjsc.com/upload/files/6392251397.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/18062015192.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/61274654432.pdf
    • http://bsinteriordesigner.com/userfiles/files/71341281738.pdf
    • https://kaptenhoki.org/contents/files/54004018850.pdf
    • http://violetstudio.in/userfiles/file/dotifunase.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/95565570196.pdf
    • http://centroolosprato.it/userfiles/files/purasawoxesibok.pdf
    • http://jumpinfit.it/userfiles/files/rinazafasakipikit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae50.bin
8729b6dc0fe7dcadabcb9819eb3c32485699ca4cd4906a38293201bdaedde499
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 10800 bytes
font_01_sfnt_off0000c745.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC745 16792 bytes
font_02_sfnt_off0000df57.bin
0390f70185ae3272ebcbb1f7581f54d59131277aa6939edeaca7f4bae2e33d1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 14536 bytes