Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa6f7ec4a1ed97b…

MALICIOUS

PDF

84.2 KB Created: 2021-08-25 06:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d711a050128962db6e833dff50b6f210 SHA-1: 0344a37e484b936a4cbd3399f67e74df99e9894a SHA-256: 1fa6f7ec4a1ed97b3734193cce370873ac943ec5a75892906f0466431dff02a8
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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zpkprzemysl.pl/ckfinder/userfiles/files/janutekegudogilerinebax.pdf In PDF document text
    • https://dienlanhhonganh.com/images/pic/file/feradipox.pdfIn PDF document text
    • https://tmtteks.com/files/rekodirowukigelaturusinib.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a401d34e98b---xivilagegipudipa.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087379f0193c---94275338030.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/42569217993.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210717051921784698h87ws.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/bamigut.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/81371188738.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/44611112903.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/tufomawusef.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/54482372675.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b54f68e01---laxulezewobe.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161215d94e90bf---31130855671.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/87944968609.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/waxexebov.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e6d3c0d93---ziwutujelidudi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8116b21d8d1e5c0ce32dfc577a7905cc/logob.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mubknli8lljmierufufqmsk08m/99745600406.pdfIn PDF document text
    • http://katachizu.com/img/news/files/10577963770.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/55776123931.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ced72e86---zudodufubuzekifozam.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/28330397573.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/buteredaxipomeduderazol.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1610a372f09b26---29709851667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=carrier+expression+air+conditioner+manualPDF 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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 10908 bytes
SHA-256: bbd5a3b0a65b2c9d44b2f6215900436de5e292a678260fe349cf0077a41a6b4f
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 17008 bytes
SHA-256: e305903518485c9aa6758036677ff1328ece802a290caceb97f71ed54b6da3e5
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1