Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f91ed5aaa56fc27…

MALICIOUS

PDF

77.6 KB Created: 2021-07-03 17:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a75ce423b8785cf8cf84af2930b40943 SHA-1: 09504ba6c28cecf79ba90ab2f87daaab4b013259 SHA-256: 6f91ed5aaa56fc2798cbe8028375a593f37b19cd45bf6e36bd0bf9eed83a9c8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ce453dbe9381500c4e26ccbe5067e693/15290011703.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2cb50dde9924875fc89b747f598953b5/97840118127.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a3e29b1eb58e50d5ee4092661f9e7b96/69325530319.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc58d8645f---14457486740.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1db1bca5f287c2a6ee5dab3868aa3f3b/nopofodirotulinalazuj.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0rf4pmr92jdoihtl6s8qj7lou3/maketipixolifobaneboduzo.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/95719891268.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/58851831009.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e9af40187ebe79866e51595b14c1a6a3/366871734.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c67dafe8bd4---fodojorigibufolil.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/pelazukasibokefemuz.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95e6a449f---50502979889.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cbe483ac---31527943077.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d9a558ce2---dozezitegixabobulixipip.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7bff8e5a0cb8604783f8e2288547de00/70715428425.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9227c94214ccc3a279508c7c3b501194/pisubegekiwali.pdfIn PDF document text
    • http://farashimirooz.com/files/86121767569.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/99149964786.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/42cf7ecd902de7b6d72df19a5cf07eb2/zuzolezebaka.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c38f4684d---nokemametelifo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hnhcmqj3j2s7ffnu6qhhq0i9k6/jiwajirakagatovumuvapevew.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/45222960017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=clearview+village+syossetPDF 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_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 10476 bytes
SHA-256: 0d65e4bb3af4ca85fde22ec2701f125d49cd47818a9ec5835445621e01f0b7dc
font_01_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 17520 bytes
SHA-256: 7877a15b4153eabccdd16a375540a2b5651d21a497c9d49c54a75122ab404dbb
font_02_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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