Malicious PDF — malware analysis report

Static analysis result for SHA-256 0835be1602106726…

MALICIOUS

PDF

77.3 KB Created: 2021-08-08 07:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a5d58ac52a6d6b1ff78c214ca7d091e SHA-1: c4c20c5044c86af8e7313fc81e76a62ba65ecdae SHA-256: 0835be16021067269500bb0767c270cbdd59bf843e432474f4a22e687fc02075
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or exploiting browser vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studioboscono.it/userfiles/files/90037632790.pdf In PDF document text
    • http://loveperfectionschool.com/upload/file/76795423463.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/vopakibibevowolabum.pdfIn PDF document text
    • https://efnnma.org/files/file/31425340025.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/59157226584.pdfIn PDF document text
    • https://aspirans.com/files/file/73070553677.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/tug7k9bvrmqlqde2aij2lq8ra7/4404209395.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/51875642449.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/detezujaxamagobipaxudav.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/86549381212.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0539a1ccb---45692413852.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/sosotutofifeselezodes.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/fibuzijiwotalegujem.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972d84817d7---sogugukalakurizavemijile.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8810950e5afa598ea3db178cfe465c33/21898041289.pdfIn PDF document text
    • https://arerp.kr/data/file///77685103459.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/90103165152.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/l4j75o75mo66sl38h5q7c3e6vd/77867472728.pdfIn PDF document text
    • https://digireg.cn/upload/79508174388.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/96694846773.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7dbfaab79376dcfc59e4a5a5fcce6073/kuwowanowopede.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/68428379145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=suv+torax+neumonia+2020+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_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 16236 bytes
SHA-256: d172cc3f2696ee9658bf4db31ceb2fca4b92cc23ee5dcedb76cf940af97afd76
font_02_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 11028 bytes
SHA-256: 39cd3d04ad6640aae36dbb840acc01c4c9409ac074eff43a39cae48a2d14767b

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