Malicious PDF — malware analysis report

Static analysis result for SHA-256 d909a0aa55f36cbd…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 19:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e14ca0b4130ac191b0db9e9c583ab2cb SHA-1: 07c2674257f5d9bec9e5b354fc70b2d27f8f5965 SHA-256: d909a0aa55f36cbd2020e669724b4f13c9ed9764c5b43b3af880028587af38d0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. These links likely serve as lures for users to click, potentially leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=watch+online+kimetsu+no+yaiba+mugen+train PDF link annotation
    • http://np-laser.com/upload_fck/file/2021-9-6/20210906091730112297.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/5544044892.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149376ae4916---nujasegak.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/rudifanapoxare.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/roxosamewolizanisilebar.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/j95q9hp4hbc830ni64f92007q5/niperosub.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zedamap.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/tiwujun.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/83787484579.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/60930122707.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/69958736364.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/vofodabelujojodesujozimab.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/makujo.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/pevifumodazazibe.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/pemutiwonopefudadolixabex.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/58394388543.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/16726321182.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/sozobazev.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/pafutodegitimenirubogasug.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/zomodututuzokizinopupogul.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/85995974516.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d7008c4e2---pelevesepibe.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/39887468852.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_off0000b1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E5 15040 bytes
SHA-256: 9a8555d76c01499b88e3aecd00c99f71fe1e4b931ebe644d78d94372e0f7e5e3
font_01_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 11116 bytes
SHA-256: e9dbc1c52d0af41f97394915447932ca0d0f6de4725641b52bb38faf642646a1