Malicious PDF — malware analysis report

Static analysis result for SHA-256 467819746d507d8c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 10:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c036ea8cb85074466f70a4720577dc2 SHA-1: 31c9c65d074707035ddf3676c985c76ae0af4039 SHA-256: 467819746d507d8c72a166b748f7a4a5a942ea0728bf61bcb520fb7eba6f3536
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://crewmak.ru/uplcv?utm_term=clock+face+test+pdf PDF link annotation
    • http://sivam.pl/files/file/95651284602.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210630085201.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc5caa8c8b---diwilafisokawikox.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/93819154333.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e56c7b1c---7017937238.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0633715001630691189.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa90d85277---namefopanezuteva.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f85ba1157c9135e0450496cf6ebb33d3/nodedivimirakekebu.pdfIn PDF document text
    • https://begili.com/uploads/image/files/6424485704.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sobaxododapivuliviwuroda.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b89d211117bb3070572d8e70fd73bde2/rerinozubalax.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/47462213390.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p2mun1uen63p22t23k5g5kk45m/tarusif.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/kubilono.pdfIn PDF document text
    • http://www.heksan.com.pl/file/73258370522.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/65136227709.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/xiguvi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a51567bc37666e36c69426e60fb5ce96/pomagafalikeribafidizi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a3213b5c7f03cbc831452486b5889ef9/38916355471.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e3130368d---bovevelujebel.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/betafi.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_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 18988 bytes
SHA-256: 6a8b472055e9399e2e06095aca9f3a7629e61cdba3929ca9a99313dc8256382c
font_01_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 10440 bytes
SHA-256: bf3c55f0671f07cc3b20fd4de8822e4e1d51790135787f93e6e5b792d98c9fa6
font_02_sfnt_off0001294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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