Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45c0f60f078ce46…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 04:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62d3d907f1d621d938eb90e1aca0a7ad SHA-1: 6ebab3cf9cc5cc29002ebc78e743290b862ad9ce SHA-256: f45c0f60f078ce462f285555b359a61d1b2b177acf65bdc560c2bb1cc637cd09
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://capthepcongtrinh.com/uploads/news/files/92310841910.pdf In PDF document text
    • http://fructusartis.com/i/File/jitiw.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/gazuwawinop.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/692elmmiqqrhrblr5obecji923/fanivitewedez.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64f7c93ea---zigiposazijibojinumezodis.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/44197222466.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b6bf696fc7be82beb466dcdd54abd02f/88402227036.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/37811790867.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/81422563375.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/21503175180.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/28169078599.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/44110633709.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6019c71e36---43012657507.pdfIn PDF document text
    • http://tipiland.net/upload/file/galajolapawere.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/dijino.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/32718ae5bd6a76867e7ae32668410fbf/88953700810.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/bevugagu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/30513136553.pdfIn PDF document text
    • https://reniuved.it/file/zirizebug.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/35458258003.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/rawidopilapeban.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a9bdd1c6db---pezuve.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/87059598928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cut+to+the+chase+meaningPDF 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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 21000 bytes
SHA-256: 3bd64eac63c41e0239971e1c8be42130ad784649a33f89360d1774e9901cafbe
font_02_sfnt_off00012ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 10660 bytes
SHA-256: 3d8a2b8b2f9fb050cdf3ac49fa3e8e7de6f353c1ecdf581d746210a44071a79e

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