Malicious PDF — malware analysis report

Static analysis result for SHA-256 419d3f735743e531…

MALICIOUS

PDF

92.6 KB Created: 2021-07-24 10:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e8c68123e9d6d6dcc2548c5a1fe065e4 SHA-1: 145e50e83c49dde8f820dd1420978b2fb4b89a7e SHA-256: 419d3f735743e5317d5a39a5dcd27993445a30a2123547c1ffd6975a0104d9e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://zoncmswebsitebeheer.nl/files/editor/file/3345559367.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/likipegulonokalitekunuf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbd376c7ba---wosejoje.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wowonukugutabogoz.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fe9c08b9649b432a1a22d0f407a61f40/22344947562.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zotoranurorigafumiga.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4e9e52993---nedagijipupone.pdfIn PDF document text
    • http://gerocuki.hu/user/file/fujuveme.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/vifaboniduroxaku.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077720f55c12---zadexesekovofu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9391b62a---96848975117.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/fekoxapuxitusibijubom.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160798233342b0---fowulagozi.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/jexajorogolegabapad.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c95f6080388f4f7916791d81b21d4129/53653900481.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f21124c2f---71949851814.pdfIn PDF document text
    • http://burragebrothers.com/demo/jolie/beta/userfiles/files/suwavo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/96133016102795d4fce5b6c77c04fc0d/55715757067.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/24d55acfa63d71a12b5f93aa62a4b523/nopiwiwonekavexojajusu.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/97507019161.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/87159462090.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/09eadf32b720296fc9868d5f1719e01e/37151626185.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rovunavulutitarofi.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/mumam.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7b7ecb95493048e4ff5161ef9dd0bd8e/18907750382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=anatomy+terminology+pdfPDF link annotation
    • https://medlineplus.gov/anatomy.htmlIn 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_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 17068 bytes
SHA-256: 4b5196de90ce6c33f64374d16ce741b70e8bf4e1fb75483808c5a12aee51a899
font_02_sfnt_off00014af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF1 10768 bytes
SHA-256: 422f10401c0d6417bc5c6661992224260beccc1cd068eb88788189a69620f49e

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