Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55f863892298849…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 10:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1134b8060c29ffb09a04efaad570da46 SHA-1: 70687b52bc9ef0800fc91e27455160882f7264fb SHA-256: f55f8638922988490df70c8bd8725cb8f2ffe68569a42a5008a5e6c9b359c5f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external resources, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a URL with 'download rss player' in the UTM term further supports the lure of downloading potentially unwanted or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=download+rss+player PDF link annotation
    • http://packamate.com/userfiles/90029747095.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e515dba6a7---28002106998.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/46875086848.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/89914086382.pdfIn PDF document text
    • http://charontrade.hu/data/file/kabiwuwifepakutifemorix.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/12536801721.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/34520394614.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/78506694088.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/sotulibexoloten.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/92070705626.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/41522138238.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e98220a9a4bdd889fc97fd07b2d08e3d/nubadotidowetididudomebag.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_200550.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/3810338098.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9028364cc---bisazudopumera.pdfIn PDF document text
    • http://mp-journal.com/media/file/62662361642.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/57073676964.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/paxupusezivap.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/kawuloxukeladaxijiwoza.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/8228543672.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/62922004473.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/kopatewaxiw.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/53532933339.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/34237513566.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/xomozapowinugipub.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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 10396 bytes
SHA-256: c5b73e5b769215ad6fb7be39b5f795eb6b71b972abdd1aea2fadb347f8e9b02c
font_01_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 17800 bytes
SHA-256: 7fe225c0e16d4e234e31e8ff202824c9ca8e65171a1e946c0631719291939fa1
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1