Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf560fa78eb6f05…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 20:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb485f2953de6d6cfaad850cc5cbbdd3 SHA-1: d999800d88816f467e98548493815113ffe7ddb4 SHA-256: 8cf560fa78eb6f0533db5b47dd1e9f10f842f81d51d3cc1e4ae57bc9d87114e8
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to direct users to potentially compromised websites. The presence of ClamAV detection and ML classification further supports its malicious nature. The document body was unreadable, but the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/eb8c499a9b05f39cca3bc99daa275d89/62250616145.pdf In PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/15155244263.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/16285948033.pdfIn PDF document text
    • https://simorgh.it/uploads/file/mumovizadabejun.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/24788407573.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/62030844346.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/1843348060.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/2696973336.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/9112669552.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/jedewisumuwuvukonogejar.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/mawaw.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109100409327438.pdfIn PDF document text
    • http://dfanchem.com/upload/files/45941820208.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/lidoxijaxigajopemaleju.pdfIn PDF document text
    • http://client.diffuse.info/files/nutesaruwevalax.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee90eb52f---lopidebinetixo.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-14/20210914152232221408.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/momafageru.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/bikebewaruwipitanenen.pdfIn PDF document text
    • http://espicycooking.com/files/file///mofurezawavodip.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/56133094778.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/38431087793.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/selipivulizalupelitegi.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/tiparewidonunotinov.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613489c2cb594---rolamop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=12+minecraft+house+ideasPDF 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_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 10872 bytes
SHA-256: 575b805297cc2af124273275f11fb04aed8b2d931fdd5243967d15f87c0434cb
font_02_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 17228 bytes
SHA-256: f44dd75464fdd03ae8209720063fadc0566578150ec2b47f8b83e11b254552fe