Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d468ab5ba15a68…

MALICIOUS

PDF

96.8 KB Created: 2021-07-27 19:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14e42e0698e17cbba4ca5ac06c91f003 SHA-1: 5c8a242a12f2dd2219402c8b8037c39e5a187483 SHA-256: 16d468ab5ba15a68c84d911ae99426a374e3004540358e5af53b48172fa10bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://footballsod.com/images/ck-uploads/files/wofunebavilinor.pdf In PDF document text
    • http://enjoy.sk/editor_uploads/system/files/ranuwejalexoza.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/zarukugezizivelik.pdfIn PDF document text
    • http://kfbi.ru/content/file/vidurokuzofeb.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/51386371842.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/165j0gf9so1m479nic36i6v3qp/doreditot.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6l8ujbq75o79igjbu5uv0qpdu4/95535072921.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uvuv51baaoicd8acsp938rq4vv/zajujipomonesanos.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210625130405.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b268a6cfca14653432df464298d88280/bibazi.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/93774915706.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/12a815grh8aptivlircburd36u/muvujijivipele.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xivafelojoniweravile.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210618131336.pdfIn PDF document text
    • http://boursemoi.com/userfiles/file/33099655903.pdfIn PDF document text
    • https://maclashoes.it/file/78950210920.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/7fbdeb333991bd668b9a7dfe0a1df1fa/29485413354.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ju0fudafsfjis918605fg56tn/betajebugipopivipozi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/63ff6a9eff5c6a799c34b057d3924eb5/72795861822.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076c98e1b093---fudoselevezidi.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pabov.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/goliloru.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/natawaxepuwadapad.pdfIn PDF document text
    • http://446888.top/userfiles/file/kuxub.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210627003112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=maus+art+spiegelman+descargar+pdf+espa%C3%B1olPDF 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_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 19380 bytes
SHA-256: 985f40ab567944c2d18d3d7ee579ac981009e27d63cc2f8aa63341a11e7d025a
font_01_sfnt_off00014100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14100 11264 bytes
SHA-256: aa33d9e8ff9ddc3d7ca4dcf262fcb2e6746a79ce54f7dcd928b3021b994ad5b8
font_02_sfnt_off00015af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1