Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9524e5e7558fa80…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 19:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f40ab088fe6e67961a3033702920ffd5 SHA-1: 380b9392b34c0ec8c6eee2429623e95b3a073961 SHA-256: c9524e5e7558fa804779aeca54926ebe8b8924512e68503baf101286abcf431c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ibshop.gr/uploads/_uploads/files/92870439483.pdf In PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902101512.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/kixudulupebegavat.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/79582605602.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210903092343.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/35817920f960af2590e796b7b1d10c1d/68356079656.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/81404023424.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/pododobos.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/woxisovol.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o92va9if97te4o8nre4rm90002/9035401170.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/a42c9370t9js79bvrlu8are0o2/tugusifumigigixowifuf.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/megifopamejaniwopuno.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/lijavegikexefap.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090613280068.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xedowuxejuwipalabuw.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/87924524132.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/47723843440.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/difesujolegovexopafi.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/9654329029.pdfIn PDF document text
    • http://sdds.be/userfiles/file/52419456581.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/20706429383.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/ladevo.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/fofinurojafivumudo.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090303550073499.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/fosobaduluta.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/lazuw.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/sekeka.pdfIn PDF document text
    • http://juncheng.tw/upload/files/tutop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+beginning+after+the+end+book+3+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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 10932 bytes
SHA-256: 17bac02fe6f1c1eb3df939d43722ba08e3a8656e5d286f35c41ad5b0dada22e7
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 20820 bytes
SHA-256: aef93770841ddf7bb497b54f67014bb566a64d39cd01aa674b289274317b6c7a
font_02_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1