Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b16b3ddbe8c2a69…

MALICIOUS

PDF

72.6 KB Created: 2021-09-10 01:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7df0224a9f960b32444d7ec1ba3659ce SHA-1: 0df10a9a5b73ac34df3cfdf79c4a3a5348a1b9a1 SHA-256: 1b16b3ddbe8c2a69a1395c5813ed9210976aef97e0614530ad77c2bf874e6381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination. While no scripts were directly extracted, the nature of the links and the ML classification strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hssanesteban.cl/files/sedisafuribuxuvuwawudubef.pdf In PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/99193716286.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090710473018.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/15381757015.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/285ec90134788452f554256f2fd5e2cf/sakefubukufejubiridufuber.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133c64603cda---20629520866.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/76647170411.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e2mq0rg1s7fp74dmc9cb1opo92/66728610538.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/15232134670.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/xixebitetipoxiz.pdfIn PDF document text
    • http://schokozentrale.de/idata/pogavij.pdfIn PDF document text
    • http://rurisnet.org/images/file/fimaparamaburedawak.pdfIn PDF document text
    • http://artospace.com/pics/file/47836425210.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/542688fb46de8f8003e13cfd351a3796/lepizevodowenegodipeno.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/wamun.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/dopubupadoxifotuvez.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/7006913133.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb6b082477---fesex.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/femukexoxifijodiwosorig.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/pijobudetuge.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wibujuwezoguxekelukaza.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/87023069327.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/50330558807.pdfIn PDF document text
    • https://telorgabus.com/contents/files/87791883557.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/dowiposekisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=naruto+storm+4+download+ppssppPDF 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_off0000ba5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5C 16516 bytes
SHA-256: a0387c90cb396a3ca95d967adca7e515d7d879e4f51dececef6f2093d956bbc9
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 10572 bytes
SHA-256: b6d7756c7c9629edd98378559d5793d54d4262a822773dc695d6612272bc38be

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