Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c0ead76b049f43…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 03:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b53638aff7082aba97284838604d96b0 SHA-1: 6ac263f534d3d1ec723042e346a4e7a6cffe4116 SHA-256: 38c0ead76b049f43783fece6239af84c411774334aeae703707c6c47629da18a
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 links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.indoorclub-informa.com/boletines/img/file/sifesewipanogaxoxamew.pdf In PDF document text
    • https://eminentland.com/admin/userfiles/files/jelamupazepujas.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/35855722448.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dobabomafusunuwezavosefo.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332233b10f3---93992933284.pdfIn PDF document text
    • http://limoride.net/gallery/file/xebezedulapul.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138566fc053e---rasajimajererosovimekuwi.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/vukewe.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/635467997.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/90504602117.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142787bbf4c0---125052045.pdfIn PDF document text
    • https://equinox-e.com/upload/files/dapepujopipagu.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/97629542974.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/kagofunuginives.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/kunogu.pdfIn PDF document text
    • https://invest.pl/userfiles/file/nojuju.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/16220836629.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/tonikodasetebelojatagol.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/72193840250.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/nivatamufowizukegejewon.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/50216712663.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/47515616105.pdfIn PDF document text
    • https://petribax.com/userfiles/file/wavezunox.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/reweg.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/41320119227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sneaky+sasquatch+descargar+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_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 11128 bytes
SHA-256: 4433995f01b6294ba6cfc5f8589d4c038ed92695db65aeaf74b1cf857efca1a1
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 17964 bytes
SHA-256: 8abfd9beae93905791c3673e6fd42cdcc8a8f9e199ad1c5b141df71a2d36d671
font_02_sfnt_off00013689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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