Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b5b31548c42384…

MALICIOUS

PDF

77.8 KB Created: 2021-09-21 12:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e2171b112e97309f552806a702d0389 SHA-1: 8171c4b2c51135ac4c69ab8e7bd1d6102446b694 SHA-256: 68b5b31548c423847a4c90a0fac63134cc00e079c1bbd3297205f84d3e90f9e0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed for phishing or malware distribution. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://archism.ru/uplcv?utm_term=soap2day+fifty+shades+darker PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa9a6e6e1---mexix.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210908053433.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/wenevaxisevunamaz.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dofibavakabofanozen.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/37251805885.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/98153053935.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/ximipera.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/73854316260.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/29853618782.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/dofudikizififekowobax.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109120755079392.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/xesubader.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/rutudebuxe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o6msq17l0103u13jp8jie6qa90/50806599965.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/78815307261.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/dixenukupizotulegezeti.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-3/20210903162332316119.pdfIn PDF document text
    • http://castel.lu/userfiles/files/77567524756.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xopupaxujurovesi.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/60843871737.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/57554678557.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0069471c93e7f4725e83a5bc783516ea/24271641714.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161462ab95577d---morulifozarujo.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/nojirikolimefitorumoloz.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/zerukujita.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_off0000cae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 10844 bytes
SHA-256: 8ff9d31606d781974db111213574680445e4bc5b9ff9d9569e782c8affc40730
font_02_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 17576 bytes
SHA-256: 2bb662e495e44dd5fa4aa58cafc30442679d3c89d3e1ad9753f09db0a8c4781b

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