Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c81cae4297eaa1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 10:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80d1489cefc712e8b8d0951d0c452e34 SHA-1: 7958e2d79e6b6cebd75de0475cfbd0c45ae663d3 SHA-256: c9c81cae4297eaa17d61899489c5f2dc24d0556d21e29a7c780e6c2acb94e8a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e87dc699d6f6fbfb29b043c997e7aad6/89163839821.pdf In PDF document text
    • https://mobiligennari.com/userfiles/file/fodajewefoxav.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/kamawunepulasavizatad.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0b4be3e---8303829873.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/10626573711.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/30883725382.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/lazemonefaf.pdfIn PDF document text
    • http://meskerjager.nl/media/files/notamokowigazogefeneledo.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/52765581171.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/dogorul.pdfIn PDF document text
    • https://pellevah.com/upload/files/18200282992.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/aoqnpcqvjmcpqkg8eiek51e5f0/gepimezif.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/5290347131.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/tejinodo.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/99900546642.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/polujikubo.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/78084170090.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/magepuned.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/64488667028.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/gutoge.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/77061237382.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/gatixaninezazisafotilujin.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138be884f475---dezax.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/15995269508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=among+us+lock+screen+live+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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10856 bytes
SHA-256: 14129a1cd98d954305e74f560a619f13bdd4bb7987eb2609bd2e331c2039a144
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 19416 bytes
SHA-256: c004fb4f1c20e48903a6bda9339d1090971de84ee19a38d165b21d2614d84102
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1