Malicious PDF — malware analysis report

Static analysis result for SHA-256 169c1a311d0b90ac…

MALICIOUS

PDF

103.1 KB Created: 2021-07-05 01:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c77068196f471d9a8703f002da1bfb5 SHA-1: 807e32e006bd7e04903ed3fd19dd1d2d203692ba SHA-256: 169c1a311d0b90acfbbd8090dc0a9afbb783ef41f0e3ce40008f5251233f3fed
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests the primary goal is to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077172d8565c---livusefokanetekixigosiped.pdf In PDF document text
    • http://ilyxrace.com/userfiles/files/josovuvedid.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086be1e9ef10---zopimasew.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/23592059853.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b18e371---sidaxuzi.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/90251924447.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/95092605524.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/ramorojelonuniz.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/759c3a3bb55c03cadf8c23f331180289/233567019.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/89196983550.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4b10f048---roraxavumimojafaxufu.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/zojukaga.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb83e4389---tanapije.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/67905820714.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/93ee3e8792c764cb81b4b489969359a3/tawatigigukudusefedap.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/tokesor.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/2764b45f275064ea1c7ebd73e0b42d85/47504626592.pdfIn PDF document text
    • https://coluer.ir/documents/file/33059213358.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/55932546694.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/1f6dab86e42a097ea12ad76cb7a4f7bb/38860541721.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/81185968999.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/a8q3rd1nafpp3vkeu052nmb0gp/vulasojeme.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160721214cc5be---kemodedek.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rhb6er8qis14554b4sorjc5792/34584397564.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/pemedesukupupupolavu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f66526e8---fiveleminogivume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fairy+tail+watch+order+2020PDF 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_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 23464 bytes
SHA-256: 7831ffacb1bacc549bbf344cbb8a2282c8160e7b3586b9722f12ecc02369d300
font_01_sfnt_off00015d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D18 10612 bytes
SHA-256: a08e1114ab109b688674cd949eb5ddfd10924250be43e93e45713f65fb2717cf
font_02_sfnt_off0001759b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1759B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1