Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61c3b604af7a7b9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 11:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f3b687fe85688998bf42574523e2b2b SHA-1: 5d5961a89f6a7c0ba1ae37da1412e1939a0d61bc SHA-256: f61c3b604af7a7b9c4b743543c5461616d8012904c838717cb5f19e35996fdb3
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=m30s+display+resolution PDF link annotation
    • https://birsamundapark.in/userfiles/files/pekakejimabixitudadesuf.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eed8116c14---sekelekoxowelagitosofetun.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/pawedotelew.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/94465749164.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/wakis.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/23570817907.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/36598533931.pdfIn PDF document text
    • https://recrut.com/files/files/katonekozovopumemutotu.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kopezolixotipezez.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/86348622593.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/22278969311.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b7ae15f8---pureradabema.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/23413376341.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/55824265701.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/18073273718.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/batogiboxenirokedepojel.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/1593200781.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/57041919741.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/pabuzekalefomej.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/52387236561.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1cfb561f9---8271901283.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/dasigesuj.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/nurovimazajosibugitale.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161381a332e393---20611690503.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_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 10888 bytes
SHA-256: fa960044afb9c1a6f0091469ed4435da437487121516af43159a12026200044c
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 18420 bytes
SHA-256: 0c16116657de8a80b4bf222a7e5a40f39d1de6232308497b5ad10af990d7898b

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