Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f66b15e8057efb…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 13:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 55ab4e7540223f1c84ec6a1b9210d5b8 SHA-1: 0d494831815b566202358e95657c316f46dd2fee SHA-256: f4f66b15e8057efbbcb3c2c125511d03c926e8af64bf021dc3250f71337e18f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The primary function appears to be directing users to potentially malicious external content through a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pistant.ru/uplcv?utm_term=how+to+block+a+website+notification PDF link annotation
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/hlfpnkgkqedcslhmmu0nbgt7oi/lizosazidulonasep.pdfIn PDF document text
    • https://bloomeng.com/uploads/tunujejonofunonitigitiku.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/vojuribuzuzudoxufeb.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/dovogibirivebik.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/nikikiwamaw.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109070414411156.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613935960723d---16352747863.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/46010664017.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/82927045285.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/58458685830.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/84470205269.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/68118253253.pdfIn PDF document text
    • http://goldengatetaichiqigong.com/userfiles/file/57186132682.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/lsptmv771b1ih1cd6iltrsenv2ek04oc/41746969309.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/58790218579.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/34207180273.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/ziduziban.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/tusijijugos.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/wegidab.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/rirerozinaxola.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/laxujedususox.pdfIn PDF document text
    • 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_off0000ab6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC385 10540 bytes
SHA-256: 7b135a1938dc295a2e4d76d26a83774d27c1e6f4a83d3535816ad2dcedb777d5
font_02_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 15672 bytes
SHA-256: 28ee0104c982bf05f958dedcd61f07375dabf40a29cd4d8e0c778011b018ad2d