Malicious PDF — malware analysis report

Static analysis result for SHA-256 874440dbdbea9039…

MALICIOUS

PDF

87.7 KB Created: 2021-08-19 09:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a93b364d4b20e3ff8e81017adbcfdff5 SHA-1: 651f44c84086cde6f38f7ca2b0069441167c0c3c SHA-256: 874440dbdbea90393c2b189a5c0e49c9c1c5ed03d84b9713b909a3fb6e0a3474
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://anhuishangbiao.com/upload_fck/file/2021-8-14/20210814080240396220.pdf In PDF document text
    • https://kodcomputers.ro/2664/uploads/37061559563.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/tufeninigixelose.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/jizevikosujurelesupiwux.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/23834036043.pdfIn PDF document text
    • https://asi-filter.pl/files/file/damipimel.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d00a42469f738856b86d5369696db5b8/57842492081.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/9375866489.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08a955909---78407446582.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/97bc10582a931bf0b7ce52ebcc86d89f/rerafabazukonap.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/netidamaru.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/pafujavi.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/80569185991.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/mudelejinawuketaf.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/wefaginediworesujodo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/31d17698f841953de704f1ba6fe6b648/regizolarilutevut.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/83266071769.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/82286505769.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/24382616012.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/lazewafoxobole.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/60517251971.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/49706110814.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210605051907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=persuasive+essay+topics+for+6th+gradersPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 16920 bytes
SHA-256: 7eb87108696c11ff837ae71d786929511bea43b2e476c48a16f7205e9df75d9e
font_02_sfnt_off000136ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136ED 11200 bytes
SHA-256: 378963f15aaac83cad7708e97888dcdb6c42fb6f0da372ffa22f2baf922fc782

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