Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcd84092224ab6f…

MALICIOUS

PDF

92.1 KB Created: 2021-09-05 22:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb5e0926c2394641b9dd98609e959567 SHA-1: 160a3b70462039bd7728cb3e692227ec3b62c945 SHA-256: efcd84092224ab6ff6fcefac8c0635a8cdda1fe007b60529d046e01f301a4f41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external PDF files hosted on various domains, some of which are identified as compromised CMS uploads or part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 http://peaceinsrilanka.lk/userfiles/file/29504695507.pdf In PDF document text
    • http://vietthanhstone.com/images/news/file/29567428935.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/zibibabudavikidoxub.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/95271494311.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/71140617009.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/feuun7vg3uq0ogfl6lf4slhmmf/52369036481.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/xuxoburujunutola.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/vanasilufomoniwubifojew.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/rusuxexejuturoxaxaj.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6rgk3ddugmre2mblu4f4f12lgb/wusuvatiz.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/sesadipujogu.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/99218302788.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2ddd0622---zozoxumikekefuv.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/bp4u5k3425uj1hp3sm3d0gckvc/fujedusixopogogekor.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/11291022125.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/xatajoju.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e085ec585b---xuxiponopowatenibosak.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/78457408305.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/27n5a80ujllirp51f4c52475a9/5147339303.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/jaminavuputefusaxugimowi.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/rodijuseziwezujenapa.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8f3c57ea397100d0342c1af97f1bc208/koridiwiditefad.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/zofewireladodode.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/49583022019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=new+product+marketing+strategy+pdfPDF 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_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 17852 bytes
SHA-256: 76ebf57cc8c32e6800194243f022d2dbe2dff6b0c1e25110b1939ad217ad1583
font_01_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 11284 bytes
SHA-256: a325c948bee6f04bff41650c177086e56414da25fb800430752650056e5d3d32
font_02_sfnt_off00014a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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