Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c38d8413cb6ee55…

MALICIOUS

PDF

96.2 KB Created: 2021-06-27 22:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bf1bcbfb9897e74475861e02eaa858d SHA-1: 587a13bf78433d4306cc9658a7d875f4c45df67a SHA-256: 8c38d8413cb6ee558d7ace0c865527817f5c1a886c7bb3b27ffd2fce678aef92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://theemasternetworker.com/ckfinder/userfiles/files/buraxejarexixuguvezajepo.pdf In PDF document text
    • https://rijst.nu/userfiles/file/zogoveposizofapufib.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/sadasezevuvapinatuwixokip.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/bozajaxoroku.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e9df70f87---81608350478.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/21481209595.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b7d559e7dd7ea5b797cda3a741f8f1ae/64122455163.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c326063e2501d4b5e112471a876a50d8/32374523098.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786bfd840e7---33000480468.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbdbb40f03---67487476664.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/3cab4a53dc51f9b44957b0a6ef290f84/witixaxo.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/75027873450.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9274349d2a81303440848391255b3a62/30241527805.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/73384950861.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/rilakuje.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/24420226849.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dutimelimagefuforesig.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99d021a64---82920276701.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8c4e932b---kurodasanefosebapar.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82a048f85---71472295007.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086477ea3bf7---witemajazokajejejipatur.pdfIn PDF document text
    • http://asustainable.com/global/file/74008513561.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/nemebutilolidoguvonikomur.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940af14dc13---nobafedixadesanuk.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/mumorosoja.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/pp7jrnfknqikfr4oqm7emga65q/gifodadilolobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=laura+day+practical+intuition+pdf+downloadPDF 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_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 17544 bytes
SHA-256: 93d11ad64bc35d4477eab9dee203c543384dbf978de954a17d3ccbcc5cf5eb72
font_01_sfnt_off000142a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A6 10568 bytes
SHA-256: 658ae140753f0b1fe0097fa1b6a63464daae6cb905940c560dd6045e40bf6a7f
font_02_sfnt_off00015ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1