Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf85a34d9a54c1a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 21:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 024e1d0e8d8c67d3abfd68191d0a149d SHA-1: 471b1e8a9b69d20aa4629647c84745e7a3c76355 SHA-256: 4cf85a34d9a54c1ad75461ad626e941df3ee99d041d30e9aeeb9cf7d36a3551d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://oniceh.ru/uplcv?utm_term=polaroid+impulse+portrait+manual PDF link annotation
    • http://vertracapital.com/uploads/files/18727937347.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109061311287463.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/49947829909.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tumozexoro.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134d819418a9---nexadoj.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/lobukig.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/7930989628.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/80686889301.pdfIn PDF document text
    • http://fourfoods.com/images/files/82551652078.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/66655699373.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/mivitagukaruxiwaguf.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/91184061186.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/ladij.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/mibabuwenaf.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wikigunovobusobakezonitem.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/68387112899.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/71494112382.pdfIn PDF document text
    • https://31app.com/userfiles/file/xepilidemonorokib.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613297e489046---26908438911.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/31006907555.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/97683094170.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/56845505310.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613172a4742ad---74496867092.pdfIn PDF document text
    • http://akademibt.com/resimler/files/41063198056.pdfIn PDF document text
    • 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_off0000c4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CF 17452 bytes
SHA-256: e7936bfb3f26acbb546354b2b5afa8782efd3b758f4d688a7a15b0cb832358f8
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 10656 bytes
SHA-256: acfcbc98fbb4148c5b78e6bcdf8c4268ec192981439d7b136c1eddcafe8d7807