Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f54b38d8738e6e6…

MALICIOUS

PDF

155.1 KB Created: 2021-07-27 20:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5de17e9592bf8c8b1afd10f65d95da8c SHA-1: fb3cd0a0c5a58a70343fac58868c161dccf62d3e SHA-256: 2f54b38d8738e6e643fb9f8f65f2336dec8a44d4bbb3ee7634336aba4c3ecbaa
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, many of which host PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to distribute files. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The presence of a 'Download' button lure, though low signal on its own, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8ab68feb5---62358869660.pdf In PDF document text
    • http://scamps.biz/userfiles/file/82532370132.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/wojepawitanosate.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/22543713783.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/3632db39c99a25919f94f6c6f56d1c09/wezilabu.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/gikaxosegusibim.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd8de19ce---79646991975.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ba718ae1481fe85764a2c37c5481a374/20454066498.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d834093ef---62779182871.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/34909143409.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/99950638030.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/72778890713.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/jakixigeno.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210702152350_ctfnf1.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623624311.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/lrg8lug4bc1i1rkvj5qos5j5n1/selewusabuleravup.pdfIn PDF document text
    • https://istanajp2.com/contents//files/golafumuxonod.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e15b02490---rofudeximokake.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/55188354305.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983972db0bd---60382504833.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5ku0f3h83mgh8c61q9phucj463/83559076013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+5+charactersPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD23 4828 bytes
SHA-256: 31f3df0038949eeb777739517357f94d774dfd8424be2ddfb1a870e8f7ad62fb
font_01_sfnt_off0001cf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E75C 27636 bytes
SHA-256: d2e4d3720ef03caa85844968f78027aa24d1966184294f91cac3b747b5dcf67a
font_03_sfnt_off00022439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22439 11120 bytes
SHA-256: 94bb718def66871e4d0a854c159e95bc5680cb07cfaa113f033f69359a5c66ce
font_04_sfnt_off00023e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E02 18896 bytes
SHA-256: 4efbc6004c5bd1a13abc533b6f10abd8b6ff3a8ab5c740b41865ea2db7a16ffc

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