Malicious PDF — malware analysis report

Static analysis result for SHA-256 753b27e8a836ace7…

MALICIOUS

PDF

103.4 KB Created: 2021-07-21 03:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d194e211e8c38882a3c5fda1d7fbebc SHA-1: ed08bcdc8e2c7b896a42fa8f8fd3b75a15a921f5 SHA-256: 753b27e8a836ace7e45815b7e80a911b3446c8bed918ecb337f02c616f93f378
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting an attempt to lure users to malicious sites. The presence of external URIs and a link farm indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://hakkabrothers.com/userfiles/file///15840828132.pdf In PDF document text
    • https://tonwen.org/userfiles/file/48413913088.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/miruzunipawevib.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/wagatikaza.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/motazametipusur.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/mirax.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210509161623.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608697dbadbf6---61839226658.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2a1952669c43854cc72feca0ba0deee6/9173041522.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9df4c50b---19394108071.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/so8tshdl1k82ldcc2ta9mc1kl1/44082195995.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xifotidepexabi.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/30169202029.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dfa38b95b---biduxaravilirosa.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8464ac70aa0428ce71a6e6a8c10981c6/mikup.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/56574ff174b74fb2f1f9f5c7d1ba1626/zadibam.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/tolowitaliwapedutowenuja.pdfIn PDF document text
    • http://change4best.ru/upload/file/37819997250.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/74912012023.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e98d98841f---6122167513.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aff7089731b---9996501829.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db82c2a0e75---bubikomusabideve.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608460eb2cf6f---50765447314.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/867481eb400df9fcc8803394c9cd95c1/padetotobefa.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/14979779454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+a+war+base+in+clash+of+clansPDF 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_off00013335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13335 10908 bytes
SHA-256: cc14579f7dc068e8989cd62868174f60776222e9529b39b8cad2b942989d60d2
font_01_sfnt_off00014c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16451 16840 bytes
SHA-256: 3b9047d92837d4687ce75ea73e105f582d12768c16968414c66f1c778d3d120e