Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba856edff3c00249…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 23:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0cd677ebf8083d78e53b77fa2a3ebd0 SHA-1: e1c1caa25ceb1ed5ea178c4c11cb8066bf5fda8f SHA-256: ba856edff3c00249e36f63ab89c48b21d7e2917cdc4b77081eca02cd9c0ee400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm that redirects to various PDF files hosted on potentially compromised websites, suggesting an attempt to lure users into downloading further malicious content or visiting phishing pages. No scripts were extracted, and the document body was unreadable.

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 https://navoloki.mebel18.com/uploads/files/49591866704.pdf In PDF document text
    • http://christ-china.com/filespath/files/20210920123707.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/rerapiloxenaxu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/79e0c808219a019f2fa2db1e904ed744/59384747639.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26018737781.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a46ade85a---52631962368.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/92356044793.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/rerawikadejofaxovonuni.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/43556976814.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/31a8d760c83f75a5d3e443031bf0e6ce/64308122935.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/laponekuxusopi.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/ninetaz.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/waxem.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/vatimegilabitiw.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/17744573069.pdfIn PDF document text
    • http://hibertek.com/image/files/20210919_221908.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/sariti.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/35379035485.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/gulajuxokejizodewuni.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9bqjchmb5oigili245359f007/2182245311.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/beredafebukuwej.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/zubaf.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/98045786045.pdfIn PDF document text
    • https://aromamarketing.md/img/files/nadukedibebawekiluvad.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/kejewimokaladatoxomebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=express+pro+vpn+mod+apkPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/45182648149.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_off0000b557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB557 16072 bytes
SHA-256: 630605d94f8c57d3e8961ca2ae55d53b30017745e37f4d193e0b0a4f2e0fb3bc
font_01_sfnt_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 10560 bytes
SHA-256: 58faa7d46cbaf15f1d4eedbbf6a5a2ceba3cf1d10c19f0459fdd53ca898047bc
font_02_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1