Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e34e41f8ecc941…

MALICIOUS

PDF

80.0 KB Created: 2021-08-22 02:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35a81143ba869b8e554b0d5491740107 SHA-1: f88966fd364f11452f0e3d5365c0be9b44685652 SHA-256: 65e34e41f8ecc941562127a049e85aeaa35c59e28fe4347513ba802d7c73930e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://imhome-listings.com/userfiles/files/12552790700.pdf In PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/53042806035.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/34625566038.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c46f0e84fb2587ca1af2bd96bf2c8d75/vipowifotaxexujalezan.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c12d1d19b54ebb9f6f4fc8a6afc6275f/siwor.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/823b1b3e881717ca5802a301bc766bf1/32898687765.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/sojuxozezojuzogixafumew.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/gakidixupevuwejibefe.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/93150039381.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9040afb17---lanulekubetipututib.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/zivetag.pdfIn PDF document text
    • https://susta.vn/userfiles/file/40563182573.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ca407703f4b0b44ef5aba2bd040d47a8/14367744847.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/jewuvogasu.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/2153911811.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a105790c601---54823515270.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/h9gl1eesji6i9k0qtp4tjdfv1u/rufirew.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eaf166dc4---kixasalelosefu.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/41733814177.pdfIn PDF document text
    • http://cke.hk/userfiles/sanikul.pdfIn PDF document text
    • http://iltorg.ru/upload/file/ronaxobotodefaso.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/dibakamutisireja.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bvk68g5i0b0gpuv32mmg56j4r6/juwekexime.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bfef6f35c---relinevefizajuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=worksheet+3.10+ir+a+%2B+infinitive+answersPDF 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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 16880 bytes
SHA-256: bb8c895b8fc2c883330a94bc4426554b340eaf6bb2743849713607634ea27511
font_01_sfnt_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 10916 bytes
SHA-256: 2417b584ef95faf53b1bbfb4fc1acb0dda95053d19839e63fcfe61432aba5460