Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6131475ac821e9…

MALICIOUS

PDF

78.9 KB Created: 2021-08-12 00:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 301bf78176facaa174d12b084b2a80a3 SHA-1: 459e720caf88a2fda5b44d655a82618a102adb2e SHA-256: 6a6131475ac821e9d450ebf710956932711395d7a8cc83e49a7223d6b735374a
164 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://people11people.gr/uploads/File/goxalowetegolupajib.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1a552993567c5362e609f5ab9e6b9344/vesolefevaketipukonalojo.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/87935288706.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/68433738700.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/bbcb27f3da3e8a1fd084f8f5c022b406/47786598714.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/90028642975.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/jepixenesuwev.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/29851978187.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b05430ba13---79766091489.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4efef782---wozota.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/puduvavixirobezikanulo.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/26908808857.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f6a228854---98189945506.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/61082177717.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/6666138485.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ec36bd5f0---gipuzogakivesiwur.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/7582142881.pdfIn PDF document text
    • http://artospace.com/pics/file/11745291774.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f67a7fd659c4a3308f0e81321e900d15/94062948713.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5418b25b5637688372f4a46593321539/nirerinusuva.pdfIn PDF document text
    • http://abwessex.com/uploads/files/78472302733.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4882b7f29---29663878251.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d3fa97db0cedf9cf873f6435eaf175a2/13307809756.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/4102359618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=riyad+us+saliheen+urdu+darussalam+pdf+free+downloadPDF 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_off0000cf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5D 16444 bytes
SHA-256: e649c90953618179bbbeb43ddb7e68c9bd8f7702e40229c181ed0cf9bcb3b261
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 11008 bytes
SHA-256: 1c0e7618d118a39924cbbcafe4cc064f0a530921a69a437c00e2fea59f83c963
font_02_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1