Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfa18271f82d154…

MALICIOUS

PDF

79.8 KB Created: 2021-07-13 17:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1f48c829113db4f2dedcb3140742a0be SHA-1: 5dae7c9c6d2a0ada286c48b59e4d6775aefdc225 SHA-256: 9cfa18271f82d154126d402f5e1510f025b0563c0235df49b42285e72edea24a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dagmar-e.de/userfiles/file/dakatalozopodikezerej.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/b681cgi96pls67n09dcbif4r42/26667145839.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051917271173499.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160750f1bd03df---sofewiwu.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/3eb46cc0e77f242b1487921ed086f78d/64315834813.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/37061787674.pdfIn PDF document text
    • https://olterus.org/contents//files/zasite.pdfIn PDF document text
    • https://actor-conseil.com/files/file/lipasamikan.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/mofalewudelajemis.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/meribopufixedoromisawak.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/90087d64027c58c508190e522d51d683/tekifokitunitimuxaw.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/pasivofopezibuwafe.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/dukaxogapapavugud.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/20514315967.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/85137814245.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/makefujutero.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/velazesemolavegubijow.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/do2egeij6ub10q8bol39eu0gpu/bafofematokalom.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078dc0f58b1c---kumepoxaseweka.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/968557d4954a4e1082712bd74940013c/sosatoloxivabukegezis.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a7983f7c77513b9163c67c140345d70d/49244005143.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b569616b94f---mutijes.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/56588987420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=canon+1025if+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_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 10436 bytes
SHA-256: 62fe12fbb76cd11473117c2dff63294c2a70f0fb7a98dd18b528c8e9080118f3
font_02_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 18552 bytes
SHA-256: ccefa1facf8d007eb43d623f55f9d032ba141d5463017a52784d01c96c014fa1

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