Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db6f9026b959118…

MALICIOUS

PDF

100.0 KB Created: 2021-07-17 12:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c52eb7f1b1ed61a82490d7c7f1815c5f SHA-1: d7bb57956fdee0e5b4bfec32ff32ee00ee4acbd4 SHA-256: 6db6f9026b95911826d8cc77e336cff4d773defee8d99c666b22fee5944ac2cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/bomajebojitamegoju.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1e1cfd34cadc228465435af8ffb829ba/7513558745.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/toloj.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ff13080b---roxarasolivokiwanubap.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da047454794---30040782192.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffeccc376a---17473892086.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/luplpt786h2qu38mm1e4qkk19i/bugutogezuzuvumikolomilij.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/fezisax.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2464608d8---85019777988.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/63428132932.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gutemuwuwotosoxopegosale.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/763816dbb2ee6206279ef40ef1820805/34213886748.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/golip.pdfIn PDF document text
    • https://latework.cz/soubory/12151847725.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df6170f3c---47844995636.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/jesegu.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/vefuzufopujonipimar.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/wazawirosigex.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5edfaf636---519024839.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/ruwewomomoleme.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/59482347863.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/62668463426.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4257d41239f1e3e68dc5eb8402f0035b/senavujulatazurenorov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=yook+can+do+itPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_02_sfnt_off0001347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347A 17292 bytes
SHA-256: d859e44c05643ffc062748f20d7a992e9b54d5c7f3e472a980199c4c738dddbc
font_03_sfnt_off000161ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161EE 9992 bytes
SHA-256: d30386cbfca81c8f44617192db8e26ab37b0dbda12b03efb29fd4b2e7f99ce58
font_04_sfnt_off00017827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17827 1844 bytes
SHA-256: 8a7186a23d265d52ad72b48385985d6772e37fdea378fac8e37cc11623952c8f

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