Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1c8a63efe87f15…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 15:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 864d93c4a82db4c1722724909bd64a4f SHA-1: 592a415852869ee625a4bfca0419d5d501103fab SHA-256: 3c1c8a63efe87f1555ed8f0edf3acf1f1c0a13b5088867f06795f75c477b3294
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities or contains malicious content. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and compromised CMS upload links strongly suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://alhouti.com/userfiles/file/51653863274.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hu7isv5manbie6i40qc39o79gk/3449528557.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/63191483189.pdfIn PDF document text
    • https://rajakedua.com/contents//files/57112286538.pdfIn PDF document text
    • http://gardatrans.com/content/Files/61011056281.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608470cd2003e---12925696923.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/36883138127.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b86e59038---64541666620.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/50529738889.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/48594916114.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/rosemesika.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/goxikoxigalakune.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3c466e727228cb3714beca1869a63d71/pigitika.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/27887839437.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd36c74f1d---87907918460.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/vawetezudenep.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/sabudaju.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af34c75e2c---towefubosuvonumuragadat.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/77720026259.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/xowufuvagekovulapovalofux.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/38531118351.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/guguvapigo.pdfIn PDF document text
    • http://beta-rc.com/upload/files/46191003873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=personajes+del+principito+principales+y+secundariosPDF 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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 17424 bytes
SHA-256: 7ccf91fb4ac9cff54909a7552a94674b0df60cba8e3a3b1ef8cac84dd263a423
font_02_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 10852 bytes
SHA-256: 115d5dfcc5ba094a00ba8eea96c724e10330db489d0ab4b653fe5a3a5a5aee9d

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