Malicious PDF — malware analysis report

Static analysis result for SHA-256 e113f3ed263f8639…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 22:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b68cf6683d67ddf224b25258a144c305 SHA-1: 3405e2a1269c0de924d7d56b31b1435334d1579b SHA-256: e113f3ed263f8639c8550f6c0cf775fbdd175f1ef2e658048c7b4b52a5c72127
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a raw IP address in one of the URIs further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5e15cc4e---20690471585.pdf In PDF document text
    • https://youxsoft.com/uploads/files/rimizavuleribetuxudujax.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/7306922080.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/16109310794.pdfPDF link annotation
    • http://xhiehchin.com/Xhieh_News/_file/tutike.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143d9f5c200b---30619651106.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/84256667913.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139253d8321f---17852379395.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/javoturidumejokebugajup.pdfIn PDF document text
    • http://dakov.hu/_user/file/lumuzaxunef.pdfIn PDF document text
    • https://rjpexport.com/files/7706612756.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/44033597379.pdfIn PDF document text
    • http://ud2-140.com/files/30287753060.pdfIn PDF document text
    • http://haai.org/upload/file/40054813855.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/88e3711ee95f48792d1ee8543fe38c72/73767845299.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23b5c8400---duvazinewox.pdfIn PDF document text
    • http://centrons.com/uploaded/file/3657596886139f86b4ead5.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/6100494678.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091212102778084.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/90586591553.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22e896ae2c75e3b6454f40882cf3a252/47362133043.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210918_15EA16C6B19FB1BF.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/sogebasalowoxivajewes.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/kidig.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/vikudevajukibaget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=managing+risk+in+information+systems+darril+gibson+free+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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 11180 bytes
SHA-256: e97babd63c9318ce344182568ad5012ae5a26549b2788fd040cea85bf476e651
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 17848 bytes
SHA-256: eae8654fdf3800486c406ac5c9156b92e09224f12b280c89f3b0b2f19577c905

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