Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e12fffb831b9e4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 21:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9296b4a1b446afab67c0518c12f8797 SHA-1: d68f234aaaf197ac0840a22e556602ce9e82625f SHA-256: 17e12fffb831b9e4bb2b564a8e4109bf5d38c09fc883842008afc784d81def07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. The presence of numerous external URIs and link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inwebjor.ru/uplcv?utm_term=samsung+j2+prime+custom+rom PDF link annotation
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/27796747089.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219612497066.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/inqjln22lhm4d04t6p6h4t8kcr/78284034790.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca239cdfc---tixilokizakoresawiterix.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/segaxuluzi.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/webibepagopul.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210907140426.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70139ccab---bojafesipovofimuzo.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/82256977500.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/zaremafolovakidemoxodivov.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/vubaw.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/86856213313.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7a3ac7d2830ee80c4858a56c1d756d66/guninamopewaponapupuped.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kubakoralasivuberumer.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/mevomafimi.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/xeted.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/bimitamujuwamamoveziv.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/34800592905.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/7469213098.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/41432636478.pdfIn PDF document text
    • http://linza-market.ru/upload/files/75067059580.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/88964472209.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/zetafox.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/kifosokataginaxadakirij.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/73692449241.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_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 17760 bytes
SHA-256: d20358d7734839671239fd875d81d95c1cda012a70122688df0d723e926d2f0d
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 11096 bytes
SHA-256: 0ec481f636a5dd63c45747dc5d91cbecc4bb9e36af812b419559ad8dc986e492
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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