Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2ae251e6e2e8f6…

MALICIOUS

PDF

91.1 KB Created: 2021-08-29 18:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ca5fc6c1fffa2b583424af417b3d96c SHA-1: 52d07fd6be982ad10482c5cd9dc2687629ae81fa SHA-256: 4a2ae251e6e2e8f6c185dcb43a8858a1dd2b74358dc3c5854c8da5853724433c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://coretry.ru/uplcv?utm_term=telephone+country+code+972 PDF link annotation
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ea21903b---texurosotulugelujir.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/7983047188.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/62234088504.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37d2755783.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rck97l072kh986v5n2o18g9jg/38540493290.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/supavikawosotomiditoz.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/punibuvulofineginu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826439b1846---kesukarozebami.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tts419fq6smu3nubp40e81huo6/xonelunizuvetob.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/52efea1341dbee8f7f14ac20f2d4c4a3/wetizimefefo.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/32982339990.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/19075208290.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/22103390816.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16095b6e30a432---wopakomenakaxibexi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/60473252463.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/futoxuranosenepokazovuz.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/24966061149.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/keluxabigamovilupave.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/xopuwatafok.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/monosi.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9176d03ade3de5974197affad11ec35e/3085957886.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/14478257333.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b27655d5f3c---sukafok.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/931d1d4a7160e66bfd0ef26a5d367840/57276094618.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825f3f5c6e6---xuvekuje.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/i3f1ed8ndmern6j3g07id2druj/lizefepomujibazelanemum.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0m3t9ng44q2qsfe80kos8hu8rp/26647006720.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_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 10704 bytes
SHA-256: 7c16d4b629f4a9703227416869263fb2df35fa25a5885c55c445fa3b6015e768
font_02_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 23472 bytes
SHA-256: 338a13e0618ee89151f57e7ee31cbc19f77ca29f6c904fac9b2a230d9f78f1c9
font_03_sfnt_off000144f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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