Malicious PDF — malware analysis report

Static analysis result for SHA-256 19160fba351b3765…

MALICIOUS

PDF

95.3 KB Created: 2021-07-10 04:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a609507484fe8b8867bbc6382ed8501b SHA-1: 0ad6a089d5143ddd2590b2ab8c8db7a0a0b592fd SHA-256: 19160fba351b3765618f2d3c213d7ee89ad23b1026695d13f76ad1712e3640b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, evidenced by multiple heuristics indicating it functions as a link farm pointing to compromised WordPress upload directories. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the embedded URLs suggest an attempt to redirect users to malicious content or downloads, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/341ff755ba92af38cd5635407fad005a/lujasedoxabati.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/metizukixalebivonebitubun.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafee763241---dasefosegobata.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/66009473407.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/davewomirixir.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c792235f2---nagijefovuxapuneduxobe.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/punavowotejaj.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecf96ad38---lojuxuxukolenuduxefuwo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d47482f9b---bowemonemonorikuvopame.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jm5kiqcu095u1hp1c01pl9tlc3/22218227873.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/42614109736.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ne1fctgaosi3gs2bsb028ja72g/bajigunotibuxesirofusiru.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/puvoza.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160928d241f398---livetakunexowoneridi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hi3e075bbk5hua4oed61cie1la/rumovaxufato.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73843491e---71738531363.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/1387877163.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d071d02f4c7---pogelut.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/48242384337.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5m1vh37bvtj72bbjfbcn7k9uj2/57365467966.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7041e8d71---22765965644.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kanemegok.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/206841126b65b62926352c5ae20c52f3/wesofut.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/51852318032.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c66c7acbe37---wopugabovegipipuf.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e5583eade5a94507957cb720f795431b/44647399561.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63704971460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+merge+two+pdfsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 10728 bytes
SHA-256: 5463417473dd446ec3187c0750f93d0853cc46baa6093124e4d277d5623caa9e
font_01_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off000143b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B7 16812 bytes
SHA-256: 4b99ec5627ac8a4c2edaeaac15d7135a854df988605df5868be1bd119cd1fbda