Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee12b8f37fe27e24…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 02:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af09bb4c848e834b9e6653f030bb859e SHA-1: f81cd48b2dc57a327b04f81c7045b067b0fb4900 SHA-256: ee12b8f37fe27e2499af4c428ea5d8708ccdee164c1321a9a4de1f50ef0f8809
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user to a potentially harmful destination, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thai-apsproducts.com/file_media/file_image/file/45296550933.pdf In PDF document text
    • https://iwanbim.com/userfiles/files/88996036900.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/49464861347.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2e103b8c305ebf3c283b6b4a8c9f55ce/zuxitosevunojob.pdfIn PDF document text
    • http://home-plast.ru/foto/files/ludokamezen.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/tipifugazisiwudunajodasif.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef57e9d14a---39965459812.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/17926706576.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/86941548189.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/49885990938.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d724d6cba---judifola.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/jatuvokebimovujitima.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/72918624372.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/pipezelokojalun.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/21064156135.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ue86sag7b4800po48tmsqhh36m/92190330640.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/luzetojev.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/rebupubujer.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/litisidikikirix.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/35591891240.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/82330318209.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/gumujelolutikunagirojon.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135863b9f5bb---kowarusemudepafudiwajiwa.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61320e607cdc6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sons+and+lovers+by+dh+lawrence+pdfPDF 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_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 17972 bytes
SHA-256: b550452b03194752e532c36410a146fb220c754b12695f947b4524f3026eda73
font_02_sfnt_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 11008 bytes
SHA-256: bb77805c73be5bdf3a72f4d38f9175243446d96e1c964641a6af0d5f58c566ba