Malicious PDF — malware analysis report

Static analysis result for SHA-256 3712adf93de3d4d1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 08:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e438d045e7bf75e45047270f1bd4714d SHA-1: 028231f97a5c0c389ebb16bafba7066d480eb4a3 SHA-256: 3712adf93de3d4d12dad21994353e1c04a599852ad4157e993016fc3f2a42b02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the overall structure point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e6a9df88521933b981e02d706694c62e/sikipexuludebul.pdf In PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/bibizazo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/sojenusopiwubokajes.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/girelipifuvoluxelijir.pdfIn PDF document text
    • http://hongdacable.com/d/files/2202807956.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/rufutitigugud.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/94224551104.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/kuvofe.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/revovarubaxobajagi.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/fizitarapidedodilib.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7ba79dea---fajefu.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202195449358494.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/38176552282.pdfIn PDF document text
    • http://all-premium.com/user_file/files/sajav.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/titekovoke.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/18065313095.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4065be4086ad9fbbb3071ffbbcd8848d/78339994179.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210907_091439.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/48768155678.pdfIn PDF document text
    • http://minerva-collection.net/files/files/tatoxevefoxijomad.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/31281395938.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/48998919216.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/2894655297.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fa7e6bc28---22705214194.pdfIn PDF document text
    • http://vipdiler.ru/files/file/libif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sms+pro+appPDF 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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 10016 bytes
SHA-256: ab0c58bca91793f0b64f79f2d3a63d870784bc7aaa76039d134a26253002fe36
font_01_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 18084 bytes
SHA-256: e62addf1bf69277e19bf85e7aa5e846e8bc4de4ed143aaee53233e359844ce88
font_02_sfnt_off00011c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1