Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55f404f3621cee2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 02:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca74167b016eb6c66cbe6697e4dd9683 SHA-1: 0e1a79d9204ab4355d2bac6e9bf58d9f566657ef SHA-256: d55f404f3621cee25d446e73d5472698c7cd729e0db62ad2a27865e4d4e2c262
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 as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of using disposable or compromised hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=subway+surf+mod+apk+ios PDF link annotation
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135710b3d17b---suginuxezafesila.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/4053482868.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/mugaju.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fupemaxexemovomibepon.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/litabotese.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/mobobifunofate.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/918960566.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/99142349001.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/poladonafonikum.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/fofivunifunexerizefifal.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/poxitotepinirevaben.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/665385586.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/bubudadokor.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/71816310122.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/riner.pdfIn PDF document text
    • http://zatacorp.com/upload/files/89924565808.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c3e4f993---dokazisawijekefomogixam.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/32821476468.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb23b2cdbd12706c238645dd10b0bbd4/70386661959.pdfIn PDF document text
    • http://edituj.cz/res/file/gepepivububexozijosopo.pdfIn PDF document text
    • http://4wheelchile.cl/admin/uploads/file/vobadatafow.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/5647115661.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/pitupagawubolekeko.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138575b600ae---15807819101.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614020c00cfe0---zedalipodurovapevetetonu.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/bamidajitew.pdfIn PDF document text
    • http://preiss.at/upload_files/files/xujijijiremegojuga.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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 10884 bytes
SHA-256: b127a7335102ec0a5c984d11509cb175c498f96fcd843cc656e006652d0e2c1a
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 19368 bytes
SHA-256: f0250582b77df462d9c80a34a69622f860778d688d63698888a03042d4960763

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