Malicious PDF — malware analysis report

Static analysis result for SHA-256 758b54f70bc22712…

MALICIOUS

PDF

94.6 KB Created: 2021-09-07 16:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b9cccbce432909e4984ff7c4d329254 SHA-1: acb4f2caecc2600b07a2c4963d77906fe42c6d6e SHA-256: 758b54f70bc22712b756213ecc266d3abcc9cb9717d9650bcbd2283818458f0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=rainsoft+ec4+water+softener+manual PDF link annotation
    • http://mcutech.net/upload/2021/09/file/16307194312061875431.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/35449235896.pdfIn PDF document text
    • https://schmitz.cz/res/file/50610437918.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210525162191740819.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/wetajagigasotanajeji.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc03d6a25ca---vipogorozapomuwurelirat.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607322056e382---kelugigib.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b0ae12ef47fc973d61a8a28d3b889a3e/dotivuzisikofaterel.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086d18356d6a---57852537986.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/69610774189.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/17259776365.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/minumefo.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/30424642743.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/39250539847.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tgf6htos4hkrbspbkqqm1king/buxufukekuzaja.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090f458549a5---19401956354.pdfIn PDF document text
    • https://argumentua.com/i/file/7629089994.pdfIn PDF document text
    • http://storemisr.com/uploads/files/90074281532.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b89e6a734---bodelakerarodikevaxi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81771ad48---sanur.pdfIn PDF document text
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/71551719292.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4518639c6afb30dc5f055a067e4f84db/86884854746.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/11054836349.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/48172c19dfd1fea2285aa8bf876842c3/57736955879.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9780ff15---mowutofimigeropelosodidu.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_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 10808 bytes
SHA-256: 6582a0fd8abdc954c17cd033073d259dfc86bfa657e631213e3e7a7bbc1d4d68
font_02_sfnt_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 17704 bytes
SHA-256: 4f5fc9dea636a26a23a97f77e50e74dc7a50caa602c60e2c5a1a5240ab2afb04

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