Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a619285cf073a6…

MALICIOUS

PDF

93.9 KB Created: 2021-06-29 04:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76934a3dabf58836bf29f69f2b8a4bbf SHA-1: 6c78a4e9acb8c85bc744fd6a770b464061f976ff SHA-256: 10a619285cf073a68238abfbabad4e9fe0eb28f95e3641cea407c7550321ab25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains. The embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=best+eq+for+pc PDF link annotation
    • http://constantemail.com/userfiles/file/162268445763800672032.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/61283447111.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd757f879---64119330665.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/malujivizasif.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/94710101553.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7939cf76a---kuvoxamudofu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852ec1610af---80521507975.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bee1c1b7a131ac147c2c58f7a4e8fc6c/vuvobelerizexetisepunuwap.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/48212623170.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/gikebududeloli.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/tinukeni.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0c008e758165ef193fb4e4590c2a6534/sijozadazibunugamube.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/25120652188.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/30455300000.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a1ed52adef4224151fc53588c030fca2/gojutore.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609225974dd69---27220920228.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf64a9233f---51377915981.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b7ee86a70e9fbf5c472f0c47a420b796/36433169634.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/kamexuwezurapagumevoladi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a7eb6720---35326953872.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/rewaxodesimos.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/49a80a4d6bc77f8a9adaa142bc571925/11976922052.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/48225698928.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/prnut6mljchpdr4glspgn70upb/vugekewuke.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 10268 bytes
SHA-256: 628c8ef3b07e5ebd2cbbbd20d7a69d2ca863f80ee46fabddc44c7ccd39b4b067
font_03_sfnt_off00013e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6C 16920 bytes
SHA-256: e92ca7b514f3622193169c8bfd09587fc6a4c05a03bfa311f44b0ecf9bbb6581

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