Malicious PDF — malware analysis report

Static analysis result for SHA-256 a641fbcd697b5fad…

MALICIOUS

PDF

96.8 KB Created: 2021-09-23 22:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2028cd04f092a6a5eef9971ef4f94730 SHA-1: a1f4da8812990694492949714a3f1245bcf8f2a2 SHA-256: a641fbcd697b5fadfb9cccaa348379ac2605908e4f1c307b4464027db4652af1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://paneldeconsos.com/userfiles/file/pekagepobakazadi.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16142075073fab---48683795015.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/savefedo.pdfIn PDF document text
    • https://turystycznapodkowa.pl/userfiles/file/dugejesokalinan.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/tupofo.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/luziten.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/97149590571.pdfIn PDF document text
    • https://pecintajp.com/contents/files/fixizi.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/sixiwuzexetas.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/xuzodetaxavupusurokibo.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/rizip.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/tafogonomalanikum.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/raduj.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210918060509.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/butukubawupe.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0d7213f69d017bba2c5cda2a790a885b/bopuwibozuvimevubi.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/75939654299.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411107f40d3---86395747353.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/xuturozatexulogunu.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/94702146976.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210911235557.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/15069286202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=jo+martin+dr+whoPDF 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_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 19348 bytes
SHA-256: 9c5772806c8d43a9676e9330bf8f5da655d137791e6beea7dd3a60e746d48999
font_01_sfnt_off000146f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0F 10244 bytes
SHA-256: c56cecf299c2287177fd96dc97564a7c3cf770359ca8793b3215a036d4dc425e