Malicious PDF — malware analysis report

Static analysis result for SHA-256 944d8f5ad0762c6a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 18:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1055bbadb01ca959a77fc004007ca264 SHA-1: ad3bfed7bea9fa4e5b83b2d28be41b2e99909947 SHA-256: 944d8f5ad0762c6ab2eaa3290919614edc2fa4cab454c896a84970e0b823d827
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a link farm pointing to compromised websites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The presence of embedded JavaScript (T1059.007) is a key indicator of malicious functionality, likely used to facilitate exploitation or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://pibar.tw/uploads/files/202109060803023041.pdf In PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepalo.pdfIn PDF document text
    • http://fruitsad.pl/images/file/2726017820.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/zipura.pdfIn PDF document text
    • http://th-hl.com///upload/files/76860116439.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161370de3ef2cb---kovejoxefilivadatofir.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/bifivuleg.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec0c79318---tegepobimatetitod.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v7v8c1al0356irnrme0a9dl9o3/60337569254.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/17698336684.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613df86d7b261---nopinojovowon.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210911054350.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/furobatuzunumufat.pdfIn PDF document text
    • http://xtra360.net/campannas/file/bufowazom.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/31734789382.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/74605700685.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/mitifazevukelolutol.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/fafojudalu.pdfIn PDF document text
    • https://armenia4d.com/contents/files/lisabobabitasufasukexer.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/nazikisojusekagurotej.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/jofozenerujepibizifi.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/panakusipefikavalib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kodi+add+ons+june+2021PDF 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_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 17264 bytes
SHA-256: d11eb192d90c37affc7aeb173bcb80e0c1111e8c50229538618310b1d13694ba
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10512 bytes
SHA-256: 3c26f2a680b5e1659b2fbccbd0c81db591faf19e84295197db1f8b9ded6abfdc
font_02_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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