Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c54b37df935d9c1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 13:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 237618a936e61db4d41b091a3de56fd9 SHA-1: b143e887c882396f1260573fa6b6fd1aac1e7f7b SHA-256: 4c54b37df935d9c170e194102c529309e0455688ffbeb61dc77184dda0adfc73
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=game+psp+kamen+rider+climax+heroes PDF link annotation
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/katozug.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614931a36223c---12955675548.pdfIn PDF document text
    • http://ty-int.com/files/files/fegezazivupalefalig.pdfIn PDF document text
    • http://edallyshop.com/upload/files/nodowiwipojasu.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/guwusirexejudefilijomiva.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109272158372818.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210913115759.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xizemeloxunavuroronujin.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/71363330763.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/8379714546.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/10356059164.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/42878689659.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/benikazotufumofusotinid.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/887335f4d5fe8c9698aec04e00373901/9832546847.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7c9dd8ec8a2ff9ad400c9701a0625d55/29107630636.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/58305293825.pdfIn PDF document text
    • http://esistore.de/userfiles/file/fimodadubomovozunalefoto.pdfIn PDF document text
    • https://remini.hu/userfiles/file/73769129644.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa434df9d---fepebax.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/94063153920.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/94037018511.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dfa1e78a---rukaroranizoram.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/98980783207.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/89483418618.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_off0000b3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFD 17132 bytes
SHA-256: b577765f87911c4a97b08e972b41586a5a983f04344ddb4046aaa980c359ecfd
font_02_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 10916 bytes
SHA-256: 8ed01721d7cd955f1870011ed2976f19edc916f6a64959e465b3f3db5936ec34

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