Malicious PDF — malware analysis report

Static analysis result for SHA-256 369e35f8bc267a50…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 08:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a50d507680f37ebb1072dbd4166def35 SHA-1: 80b766bee4e60d06806f8d775745722dcc7daf58 SHA-256: 369e35f8bc267a503fe986025741404c579f23126a2468b51d6a2c5213ec77f8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves directing users to external, untrusted resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://precedent.by/_newsite/images_from_html_editor/file/nomeka.pdf In PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/ganosuwifena.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/jemofojakilagatabigonalol.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6577fdbae62de6eb834e25e27ab6d516/gusavupomebajufurodazi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d6e0d670f---bewokusesago.pdfIn PDF document text
    • https://ebooksweb.net/files/file/jujarusisukisino.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26267875321.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/redivetog.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210721094828.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/xaxisitej.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/28456658407.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/64721927910.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/movoparetivazepuvezotaxok.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fd8f63723d0d8a085739d4cc14979c15/51417448632.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/zumakixuf.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa38d7db6d---tumunazibidotitugi.pdfIn PDF document text
    • http://decorstore.eu/upload/file/zuxugikebavaxedeb.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/mukubokatoguwezezipawami.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/uie0c47dv78u93fon5ffa4j77j/pitowig.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/nutixa.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a904b9cc---xujejanozawatemewek.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/nemorolilazi.pdfIn PDF document text
    • http://fkhd.cz/data/img/56406851684.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210811_214250_6236.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/kusoriziruzuxoragade.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed85055398---33463098198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lathem+400e+time+clock+manualPDF 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_off0000cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 10576 bytes
SHA-256: 1ffa81a8becc0f30c37cf67498dd1a61214335942179528b480e436030d7b418
font_01_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 20168 bytes
SHA-256: c327f74ea94bb920cf6a5826aafe5a44b4df1e5a4a2bd0ee912f3eb81de7102f
font_02_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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