Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb52903ef5afe0a1…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 06:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4195c5787d945c41e64aad9fd8b08ad3 SHA-1: fca22155eaa1e31aefe308f1062445f7fbcfa4f0 SHA-256: bb52903ef5afe0a13160664f472c924db22723995f5b35336347e6b9ecbf5b94
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=pdf+writer+online PDF link annotation
    • http://st-ark.it/userfiles/files/bamivawapivumajofegewo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/61ib0ftk4r2gsk8lv9s74oc716/fimedug.pdfIn PDF document text
    • https://ekransamara.ru/files/lilotirilojubepow.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec6671913---mamikuv.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vubevip.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/75034054114.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/23088899673.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/wupagatamavajased.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210911100735721249.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/33262072608.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/dujolaxatuwudagubaromiri.pdfIn PDF document text
    • http://eternaseguros.net/files/files/laramagisuxivujunoso.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/64450501370.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/32400576157.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210914_031CF4B63E12BCFB.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/19100976465.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424f2f9079d---rizatebipiz.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134511fe848d---vujiluburimapekamizonadi.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/73410617233.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631569984.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/tomixevapuvitikixumum.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/jatijapawuwupixemowafabu.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 18160 bytes
SHA-256: 2d1e3ef8825115dd46aec41575a2146fd9d1a4b762477740df762497a4594b70
font_02_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 10104 bytes
SHA-256: f427d02cd291e996fcd662195fd5389288481ddfa46f61de8c1746cd5035f35f

Open this report in the interactive analyzer, or submit your own file for analysis.