Malicious PDF — malware analysis report

Static analysis result for SHA-256 98518e6aaca6abd6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 16:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5f9d11f8a2135f4bbf5059a4ebaac19 SHA-1: 28196708a79acfc43fe56ffa441ffa37e1e9307e SHA-256: 98518e6aaca6abd6bd2bde730af1e0a25c33ba3fb9c9ff8570f8a4d386bddf6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as the one pointing to a WordPress upload directory, suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://derey.nl/app/webroot/files/userfiles/files/takagiwiguxib.pdf In PDF document text
    • http://idroter.org/userfiles/files/27872383334.pdfIn PDF document text
    • http://zzquansu.cn/d/files/70926380117.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/vaduvutazowibapege.pdfIn PDF document text
    • http://bushurov.ru/images/files/sorenawuvimibixa.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/32b027359fc89a34bddf9f57758bcca9/gezavonigiziregowaza.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/63957695712.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614216b59bc88---girugo.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/49445266917.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/denekisokij.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/fuwadala.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/radepeledukilavadoji.pdfIn PDF document text
    • http://glttek.com/userfiles/file/dajusobajowezozabu.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/98407923391.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/22450877721.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/85624123031.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/bimuzogesomurogakon.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af44976cb4---54833860866.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631310805.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/giratajotegedul.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/57419652400.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/35408814134.pdfIn PDF document text
    • https://cecprint.com/images/file/55610796114.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/5329063841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wwe+battlegrounds+for+androidPDF 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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 18344 bytes
SHA-256: 50b5cf50ab852d75d65f2a452bdf23c9cb852d3fc9275a4291a4f0d1bfdd667d
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 10848 bytes
SHA-256: 769a12200867c81d5318f39757db9cd30044cab76fc630c806beb7f2a44f19b9