Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3cb0583bf66d5d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 23:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0fa34fc0fb0482167cfd68cd0a76fac1 SHA-1: 4a3f29775786778dc1d0f0ca05f7753558c3a137 SHA-256: df3cb0583bf66d5dc2bd36596aa13df948767f403660b03979889a8d74b7dccb
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting, indicating an attempt to redirect users to malicious sites. The primary attack vector is likely spearphishing, with the PDF acting as an attachment designed to lead the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ingpoggi.eu/userfiles/files/18453250442.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374eee1fbca---bojijisulezonovilego.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614307e03bc25---zafil.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/19677322691.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/jisozevibagam.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a997d2cf0---92485402747.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/sosube.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/ziwade.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/85980031196.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/99151475070.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/73599873342.pdfIn PDF document text
    • https://polaria.cz/images/file/55248224518.pdfIn PDF document text
    • http://stevis.cz/files/file/wimapojazomebawugor.pdfIn PDF document text
    • http://chicopharm.com/upload/files/19832767850.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/41725843980.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/dimukivigali.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/cd42b7d086b60d7a73bce5c21a83e074/43916790009.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/virimapogelezupevugopu.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/22214396733.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/43311697245.pdfIn PDF document text
    • http://santeh.md/img/files/womepoj.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613594b4b5f66---refinesa.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/dagewoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+emoji+stickers+for+androidPDF 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_off0000c5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D2 16888 bytes
SHA-256: 9f5400f0324f91dfa977b13f2e0bff59bfa74d8066d00d02f2d45c4a46ee10fb
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 10788 bytes
SHA-256: c20bdae6bee931b7efd841b5530956cf70a881753f2f3e02c3bd7fa378b2673a

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