Malicious PDF — malware analysis report

Static analysis result for SHA-256 a877aa67c0550277…

MALICIOUS

PDF

85.6 KB Created: 2021-08-13 06:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06722e3159eb055b4adb9133f7493408 SHA-1: c5cb844e563a10d031fe53b6827c388371079e12 SHA-256: a877aa67c055027703b7188bc79ae1061406d263a2bc966e5a0faf8ecc18a65f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the 'link farm' heuristics indicate an attempt to direct users to malicious content, likely for phishing or malware distribution.

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://smidgel.ru/uplcv?utm_term=etl+low+level+design+document+sample PDF link annotation
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d435855b8---zezeberizodejizewape.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/pidofixaxamisa.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/gvdai18qmj5cltfnk9j7c31u8q/gigogofenexet.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/84319719350.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zuzesofuwig.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/84383279517.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/71700029349.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/29475686496.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/091625171013.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/glic9ct70mbtp4qck04tnlms9j/35872866787.pdfIn PDF document text
    • http://huiking.cn/uploads/file/092138432637.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/31549081300.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/46824913855.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/083d62014017a6d26feee5c507695c38/gilopepadopovuwaje.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/67379601610.pdfIn PDF document text
    • https://masukpt1.com/contents//files/39268856724.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/93575701193.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/69240665446.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/92326843544.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/96a4635e677d188f7d1226e8599a349e/tajowedavatuven.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/10676273d5274b9dcb90446e17f62c0c/61547153121.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/a9p10s1fokol3gt0qtr8p214n0/bibumapavaxikipat.pdfIn PDF document text
    • http://www.celso.org/download/nesuminowojalituk.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/36346313109.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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10992 bytes
SHA-256: e1343e5b496f60cdf10ff1683273f7d54af00baff5ae5b6a437db6397247c568
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 16648 bytes
SHA-256: aadc86c6e7190d066da4960616a2cf1984f457c28a6087f420fc1fa86c297d8a
font_02_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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