Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd5e3e3ba0b8ccb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 04:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d20a379ee48a7a68da6efd332f3beccf SHA-1: 3af0008d7f4fe93cde82662c87dfd220d97053a9 SHA-256: bcd5e3e3ba0b8ccb4d4f1fc04e41989d2d7bdcd0b5b06af4e7aa3addf645b6bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The heuristic firings indicate it functions as a link farm, likely designed to redirect users to malicious content or for SEO manipulation. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dblbtech.com/userfiles/file/50384899554.pdf In PDF document text
    • https://newsru.md/upload/userfiles/files/95717766981.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7260dcc3---48022702685.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/26318419479.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/fegevare.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2f5de926---76066007477.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/64b306e51006c8e777112b169418ac03/55634916130.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/zarijivatokojatutaxel.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/wejazetovogaruzotefeji.pdfIn PDF document text
    • https://agrando.cz/files/file/badedolipefu.pdfIn PDF document text
    • http://citty.org/images/uploads/file/61594745506.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/gajirogafowixi.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/golamotizabof.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/leruwavenixiko.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/19603469406.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sewujejogudomugosexu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/jodezulajexeniwiwasog.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/wuvigukodarigelimaviku.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/fezoluz.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/buwulujelib.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/30304792554.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/44221778038.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/97120159964.pdfIn PDF document text
    • http://araratmebel.ru/img/file/60428522657.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///zununodopafagividu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=real+minecraft+for+androidPDF 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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 18032 bytes
SHA-256: 90a538e6a621684aa8c59842e49d82d57a6910e645b28aa2e68958f65c6c30ba
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 10512 bytes
SHA-256: f5fe96315214f684bf234fa13f89d105aecea9460b36946248b75b262b062aa8

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