Malicious PDF — malware analysis report

Static analysis result for SHA-256 508f31216e2212e7…

MALICIOUS

PDF

90.5 KB Created: 2021-07-02 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 95433e99c3614ce449c09c737f01afe9 SHA-1: 2a6bec7e5e226b26c2b3e660047245d80a0553d2 SHA-256: 508f31216e2212e7f28148c58463296be65fd225ac00d884cf213f59f9c86321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=star+method+civil+service+examples PDF link annotation
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e6409625c3ccaf3faeb81988025e8fa0/41454106682.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/52737928135.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/majumezit.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xinoxigezuli.pdfIn PDF document text
    • https://aitalk.vn/upload/files/62982659985.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/47833ac52332e2e3d0c6fb1def63ad24/wedopegulakis.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/vukuboxiwimofabobuweta.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/dbb68e547d1db56246eee25db54fdc53/43628786798.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/fafag.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/wuwofuxefodubufopib.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e6d08c044f965b949412ea5aab5478db/96894606213.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/5537451647.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077da80944b1---11853788710.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/75502e7db8cce4b61a3992b082b591d4/lunuvotelemivin.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cbfe16c8e---80014842511.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4mcrt1jdj93l31nh90uhnssbel/64148617123.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc1ccf9c4---46990175670.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/19506980699.pdfIn PDF document text
    • http://kelvista.lt/images/files/33763825312.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/58047472121.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd06b6c250---kelatilixasagup.pdfIn PDF document text
    • https://actorconseil.com/files/file/84134946569.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 17428 bytes
SHA-256: 108679cc1f477985df78f4f3352c9ee632eec34a60e2002149be24d6c6d8c9be
font_01_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 10920 bytes
SHA-256: 09f75edcc1700a7320a0b38ec300710da9329c3b8a2a39bde624fd83200156ed
font_02_sfnt_off00012e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00014414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.