Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8207b6033e5e05…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 04:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e703a54ead6eace640cc831eb8a0266b SHA-1: b42385ab5f4978dd1201c8f724983ffcbcac2245 SHA-256: 0a8207b6033e5e0536e5f1a51c7df95d39f34ac6d87d0f1a6ef370540f1e0b29
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious files via a link farm. The presence of embedded JavaScript suggests an attempt to execute code, likely to download and run a second-stage payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The primary lure appears to be related to 'minecraft download free for apk'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://coretry.ru/uplcv?utm_term=minecraft+download+free+for+apk PDF link annotation
    • http://cudicio.it/images/file/robex.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/44530194391.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/70381088553.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/79162119640.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/34230323338.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/lofof.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/porisukuwovulo.pdfIn PDF document text
    • https://securitydm.net/slicice/file/4199884799.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hdhqnv10q4kvb11lc5molmt0i5/jelenivu.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/6818574747.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109110218432493.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zogineg.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/67419205955.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/zodejusafinofuko.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36205130445.pdfIn PDF document text
    • http://tfforming.ru/d/files/gipaguveb.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/14208478283.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/18034d101d4a40dd7f078126288d5863/zajinizebibuvuzunit.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/25228351289.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/gironamigif.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/53719997639.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/kokupufasa.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/93111561382.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137596b3671a---vamewusubozigilejafoteg.pdfIn PDF document text
    • 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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 18492 bytes
SHA-256: 3ac31b3377ea8aa09ff77d60aa25afc33bdd620ef00a0085357975aa94947bc0
font_01_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 10616 bytes
SHA-256: 83b5e940c0dd518578eb8b0f6f6ee1b3e7b37a37aa9769fdd0a28be13c125e0f

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