Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd54fd365d4ae4f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 02:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: deb8beae40939131a210823a108ca3db SHA-1: 4e44a5199d95f3301a46ad2023bcdf2fcc0b3012 SHA-256: bfd54fd365d4ae4f944728ac69bf15ebe8be8251ea26882a31401551c771d976
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=how+to+tell+if+my+android+has+been+hacked PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ao0elhe9vtd0fe8gih42bd015j/kenitowe.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/14412472638.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b4735454f134495d9e5005c991c05255/bajapupewiwomisukuwavi.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/50285337926.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/xutol.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/wuratus.pdfIn PDF document text
    • http://fnathservices.com/upload/file/pupowu.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/kezugaridunololimosi.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/58050809470.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/40575592212.pdfIn PDF document text
    • http://skupka23.ru/upload/m/83543695229.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210912033540501.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/80372323273.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e860818df3---84268403111.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210913071237.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/30724494462.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/65509877671.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vgaehdoubk55evfeardb6d5s44/58835969152.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/xudolepusukaf.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///78802129359.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/082f2aadefbb8d593117203bda9b7ffe/42208598014.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fovufaboviwud.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/65953282824.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/bakafutab.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_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 11164 bytes
SHA-256: c6b9975b8523b63b458d5ce08c4ba2ca3cfbd0ac3008ecdc5fbe1659a14804de
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 17144 bytes
SHA-256: 7784ea422d5e60a6dac5accb882903e2885a2ae5147ce500016429db02075066
font_02_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1