Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcf8d7dd3ab1e27…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 13:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59d97a8c6267244e4bf588b7b7526bdf SHA-1: f953b4e47d9918fb549db04730a4897a94363bfc SHA-256: cdcf8d7dd3ab1e27bf7a0f8b37ec8162fe64e0809bc2089cabbd82c572a2b715
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external PDF files hosted on a variety of domains, many of which appear to be compromised or disposable. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to distribute further malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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 https://philabc.ru/uplcv?utm_term=pathfinder+jade+regent+pdf PDF link annotation
    • https://tl-systems.hu/files/files/33493320608.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907003531.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/50443004267.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/wasuwusukibuvewuzaxawepi.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/kevelazelodofukowelodote.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/29487800718.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/moraboputatuxuruke.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613c818a7a56b---35033336682.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/mokeludodubipofezatixaw.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/38425310665.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lv8tmkqoq1pvkbr3huqplpb4hn/rukeguzomisalekajipixu.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/45998762843.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/penozuxatugofivuxajiti.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/48411262961.pdfIn PDF document text
    • http://robedecreateur.com/img/files/71798116344.pdfIn PDF document text
    • https://ocw.tw/uploads/files/vapefomuxaz.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/21163348503.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/94079926497.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kejij.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/devekiregujixoreborinu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7bc47db6e---61232498839.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gajopujosuturotuwe.pdfIn 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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 10572 bytes
SHA-256: 4ee4605fc222572f225f18a8e47d44e497e43ae90d0d28891f68e8a1ac227d5a
font_01_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 17412 bytes
SHA-256: 736d3a9d92a26e19de0bf24e8ca48a8dc72491bf7d5b584a99fef35a52bcccef