Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d9c8c45c2ee0c7…

MALICIOUS

PDF

99.8 KB Created: 2021-07-23 10:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7eb3999f73fca3fa9295c529fd462a8 SHA-1: 9843a980322b8fadd28797dae83160adb7a0b976 SHA-256: 72d9c8c45c2ee0c7d7341f37b2752103eced539374282ccfb7af2bfa45b6a95e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. The document body was unreadable, but the presence of numerous external links strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://ottotech.center/userfiles/file/dazoxogukizusumo.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd582e942b---pamoxo.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/c61e554746aef3807c6e1f0fac1c1637/rubivejazunanegifoba.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1369c758---bitadusegirumef.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/683n44emr7vpda7vm9gp8p9bkp/36616398267.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/32499824998.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed59d6d13b---wifojuzapoxudeg.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160871a72e514b---44010603009.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/dazagumokovifowapedobeweg.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/26543659750.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/78449633461.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/47050371366.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2aba6214591ba35ae1439904be2d35a7/77036060947.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/rukipozudopolomut.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160703be76ae69---tosofoke.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/72780ec574ee90f368de7278eec5885d/xodesex.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/32262666640.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/qq9afugbdu2964eoo2j846g3t0/9527087233.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/lotujevat.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/43922598105.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210715154721.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/eisf2djuikhnnglumdrdnu11rk/jetakunujoromuwovamirag.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/3324058751.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6e1d21c8---wifinasapulogas.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/bixefoxibubutur.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/pekojugakuxinejewebuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+a+kandi+flowerPDF 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_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 17476 bytes
SHA-256: 2abde95e41f16043a7ad71621b8d53ddfd440a491092a2fc04e50b8c7d103ba2
font_02_sfnt_off000168ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AD 10516 bytes
SHA-256: 2513e016d0f16b25296511176e3e34a69caacb84a3a552366ea6ec0852fe2c1c

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