Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbf736d937f73c0…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 14:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dd1eea2793b33f0afaf19fdb8db7a6d SHA-1: 092a574df2d3ebf448ace7f9a7a958f5bd215dc1 SHA-256: 0cbf736d937f73c09e4394e71e6a4f567acd3b771df15c4783af924d5b1a89e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://doorsatyrau.com/ckfinder/userfiles/files/78217285369.pdf
    • http://pulsarvn.com/media/ftp/file/wuwofawepupu.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/db9f54b6a60a7a0c69df475373516b5f/jafowineritupakezugufip.pdf
    • https://banghenails.com/upload/file/legoka.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3abc666b2---46587454826.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b3621f3e---66688270639.pdf
    • http://nakatka.com/files/file/vudejejatiwawozuseso.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/82372927724.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/202505d4821bd3335b92425530b60446/xixirefogofuxipituz.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/09ee0cb533cb4f618c2595670c97bd3c/6259849411.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d74ad6f0---67084208739.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/j0c3kqfqlllmd8hsqlgp3audbc/tonorifebigowiwij.pdf
    • http://alnoorcity.com/userfiles/file/tofulusojaxubemakusu.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d15512fe426f4c8bc5d1f943d9c90b24/goxijukezewif.pdf
    • https://tepihtrava.rs//files/87069592781.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/54bbe8de2243a625da99fcca20b96279/zosigizidijez.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/gazekimewadiwoderagurafab.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/43603838685.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9657662d6c---xixawo.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf666c48852---37651804302.pdf
    • https://sensorservice.org/userfiles/file/36753803829.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lakes+in+southington+ct
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c6eab9efc62bdf2b6127ef5551b473f4/pajapumisabete.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ba.bin
d654a83b49ec0372059e54662b8ddc9962323f7d6c027a5eb23db237aa7d4a65
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 10512 bytes
font_01_sfnt_off000101a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 16792 bytes
font_02_sfnt_off000119b8.bin
b566ef32f8010c0e1c39497bb3e006052d078ec812da0cf1d8167976cc93d6e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B8 17708 bytes