Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffd2b3ba69c7214…

MALICIOUS

PDF

93.6 KB Created: 2021-06-29 05:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 438721f7986fbb48538129fe2468db85 SHA-1: d71286405a181bc00a025533e0d6e1f047c42f7a SHA-256: 4ffd2b3ba69c72147187e2786cfa6e062ae7a628391634904127ac0db8c1fcc6
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=what+do+you+do+if+you+lose+your+driving+licence PDF link annotation
    • https://sedefartphotography.com/resimler/files/biretexukanizaz.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d17e3eb7---pipudedamufi.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/96e61ec54a995316c514d353bea53412/zitowewebarefupono.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791a3469b10---62462718977.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/83149484035.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed247db790---60601118349.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/40178018276.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5a05b9bf943b27df404638fe456ac591/39629099991.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/mizuxor.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dd83ee308---33437052989.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/10369953922.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/ladagazipunebubitotidurug.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/61287650413.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e45630bbe70c61eb3f234b5af88d7595/7595939180.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/76754675875.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8801b8982---99548469415.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05e01a80d---89055610952.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8723b180---nuvuxuxiriro.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/28449357307.pdfIn PDF document text
    • https://hse.tw/upload/file/67778428711.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ea338a610315a7fea2a8822f2978dee3/11435101104.pdfIn PDF document text
    • http://www.puhito.hu/uploads/miboneku.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_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 11028 bytes
SHA-256: 97eb4d281fa1e5bec8860337db05cf734f3795e0d26f25120bfe9ab940b3f33f
font_01_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 18136 bytes
SHA-256: 412fd1a798f6925efd767d568d75b0248636beb53f472b5d2b9caedfdb05928e
font_02_sfnt_off00014efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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