Malicious PDF — malware analysis report

Static analysis result for SHA-256 97838e348ec9b8a6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 09:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82d225ec14f7a7fdb336ed4529ed0bc1 SHA-1: 1493920462059302fa35845dd210d21afccde6df SHA-256: 97838e348ec9b8a6b62e03714c4b5f4337b1c406b91b05e546e6fd9e1f692410
156 Risk Score

Malware Insights

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

The 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 and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF's structure and the presence of external links align with spearphishing attachment tactics.

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507a1c225b---dolakalifo.pdf In PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/45601908379.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/76473542914.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/tutopurokowulaburuziwonib.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/gekowewenegexoxugasosivok.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/16536021260.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/66418879931.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/84184974292.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/7106289189.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/dokajonimakiponewore.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/12264107045.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/79626920310.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/32495191787.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/wuzijulovisadakivivirozi.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/pofoporonugagejonuta.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e0698a177.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/dakeg.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/42940991594.pdfIn PDF document text
    • https://pepsima.biz/files/file/28108978713.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/kosawatarunavivi.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/37119136781.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4cb74cb271a63598abe28bc8c4196595/goraronutegapakofak.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132ced07b6d9---fimodemumarexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=successful+writing+proficiency+teacher%27s+book+pdfPDF 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_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 17560 bytes
SHA-256: b07a92f80e483cbbb2e92b1fc50a3dc214b8fdcd3d5e7ada1c710ace519cd4df
font_02_sfnt_off00013215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13215 11540 bytes
SHA-256: f559c23aebf4df66efd95aeb1d5087b66a1ad4adba99dba0ecc6696dfaee286b

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