Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af9415f13bace92…

MALICIOUS

PDF

104.6 KB Created: 2021-07-05 08:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f104ab0aac9354dcb8252c2f6d58baec SHA-1: cc976f76b5b1e0ada8df77e85dcb91ee8f72d835 SHA-256: 5af9415f13bace92de2db9a7bdc5d9eddf51aced153e5a21e5f069ebb01b1d23
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 high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or unknown domains, likely for phishing or malware distribution. The presence of numerous external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://soepcentrale-dekeyser.be/userfiles/file/75603914860.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa23c6090---mufadisizevamibukemomerux.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/fifurasubo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/0ket490jrddra0ulm7lo1ev6pv/72086697888.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0temb0ls3i85r8bv16ocq095uh/kopububejisojiroxumovamo.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/dobovew.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072743bb86f1---kovivufapenume.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/40835865363.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/0lmlgncu8lvvtv0km37lg5bl40/damatekupeje.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/16207282268.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbe3ddaf6a---pinozopotusowaxafodu.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/72472848602.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/68316853579.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/42035527435.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160abc2c671f97---xemavadefuxumidafur.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/numalulosuvix.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/76bda3cf4ef7a5e608b0542367a38aed/xivitatevu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e47e0ab119c5c81252e5caa5cde2f06e/sison.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160854caee6323---rotowamejozipilosilupol.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074173862224---95024978924.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/zasixerufaxixamod.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/fopiluninefekunisufinev.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eadbf6e77c---575704670.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/190783b1341da9dd9b92c778b26eaa4c/31741706908.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5b8084a30c2d32a35e7d711974bc3d98/97472283514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=which+key+is+the+shift+key+on+a+macPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CE 10656 bytes
SHA-256: 584a9da15236994a4ffd13af7b6bfe6d8b6f7119210737d09a8a7dedc8b9ab7e
font_02_sfnt_off00014c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1B 16084 bytes
SHA-256: c23a78767c17a1614fb89d96e2d4a0bb3f466bbc82d371f47e982e9626fb525c
font_03_sfnt_off00016147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16147 18988 bytes
SHA-256: 5ba99a9cdb5de5767798d685e6f95c32a60f04a2edcf37b5ff7b95f083abd2d2

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