Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f7f6bf7979a38c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 01:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6b82dbb40487d8ef0209f2f71393a30 SHA-1: b0d52f11ec095462675a20d40ff90293cb624639 SHA-256: c5f7f6bf7979a38cddf55fc04240d6f0ab93a9171ed3293e09fcad316cb77b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URI links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.hausbaumesse.at/ckfinder/userfiles/files/nekusujaxesotuz.pdf In PDF document text
    • http://peneleos.pl/userfiles/file/82203628082.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/37616993450.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf181c489d---84926542463.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/38665986029.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/ruxenubojijenazidukumod.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/92568242975.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3a940e7ef48e8fa83cee3a42302f45af/lamoji.pdfIn PDF document text
    • https://eclearusa.com/images/file/79276687716.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/didolatulam.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/47666414081.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/sovubesulug.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/24119198656.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/davojutovigaxitemi.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631324642ba03f1aedc8db12cdb9.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/figejupumexetibe.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/11480251085.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/1859483792.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/pupekuput.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/aa5c34536dc6aa071aec1aa1dca4c5ac/revaboj.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/tupogojedesowujuwozam.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/47749195913.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/25778597596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=change+your+habits+change+your+life+tom+corley+pdfPDF 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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 17736 bytes
SHA-256: 390b0b0d7cf1ea5906a8a24500956920f649a6e77896e44d192b4f1c82a28399
font_01_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 11452 bytes
SHA-256: 6e47cb75c756af72e43acbe9bd53827c9778bb2f327fa8be4defffc74253cceb
font_02_sfnt_off000133c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1