Malicious PDF — malware analysis report

Static analysis result for SHA-256 81de64395560ee1e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 19:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b725dfdcc37b07263c2fdea041e6656f SHA-1: ac677a2b4902a102fc176c4494a8f2fa8bff0fe9 SHA-256: 81de64395560ee1ecbe8631c9293fff46573312f2a5669019cab47e9d79dade0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, presenting numerous URLs hosted on potentially compromised or disposable domains, aiming to redirect users to malicious content. The presence of a link farm on compromised CMS upload storage suggests an attempt to disguise malicious links as legitimate files.

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://momentous-inst.com/uploads/image/files/jisokagejesipoposejika.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613854eb66085---kejenekodunep.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109060426181537.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///ridivowinimag.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/92929119927.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/tisuzerudar.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/miwobemuri.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xezufimaraled.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/84234083026.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e69be62aa00b0e174ed569509209bc7e/75138317554.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/92299153582.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/rovowevasef.pdfIn PDF document text
    • https://ms02bet.net/contents/files/76929972074.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/zefili.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b48711940---43931060630.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/4707276417.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/rotizezisunusazedor.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/zilibawewuwuzosutakeloso.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/dewujojuno.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/36821709250.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/sufib.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/zulakibok.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/kazanapuvipoj.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/78267134934.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/b5o1makfbi6254coe6k1hjfmk2/75856681974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+pocket+edition+beta+apk+downloadPDF 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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 18080 bytes
SHA-256: 740d27ac4e376887155b73377b684ca99512060f254f438ab72f318456092b93
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 10756 bytes
SHA-256: 719653fc4fa0145468516bf6699122866e7ba91061321175825853a87de37b0c
font_02_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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