Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb12f2d9cb3a39b…

MALICIOUS

PDF

89.9 KB Created: 2021-09-17 20:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cff21643d9153ee0874aad418847cca SHA-1: cb8e330384f973771191fa45899e920a26aa4215 SHA-256: 1bb12f2d9cb3a39b4d76d3571ae77b2cfcae9447bb6f2bd1b68e0b1b532b2267
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=bend+and+snap+legally+blonde+musical PDF link annotation
    • http://eyela.kr/uploadfile/fckeditor/file/7066221203.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/c9ac6nnuptliimcsk77q0u06rl/nowejuwatutepig.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/rivedujibamuruba.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109091504202458.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/dovivosifiwenotetopib.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/67765121258.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/81852959894.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141e73ba9520---77262896686.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090405502273499.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/gokebogijotutu.pdfIn PDF document text
    • http://orderkai.com/uploads/files/87630971669.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/bexebametawodubit.pdfIn PDF document text
    • http://raczcsalad.hu/files/mulogijiberiro.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/xemezakeg.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/robefuzozapotozita.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/rotijazajewusikibimu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/png2dj54as7fpkt5pd187h4qd6/93616953062.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kenitemivojupewofuloge.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff4495ce0---94919612465.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/vexodapidarivofawokam.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/29634176805.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lelawavozerexom.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/vafazerebewejira.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/zujimemogusotuzapof.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_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 11068 bytes
SHA-256: fa4383b4c8abfd4cfb0261fcae8be9a03dda71c2a24190e2f2fe76b33d39b972
font_01_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 20188 bytes
SHA-256: 51c492f79bd1bab4b69b9afb113d66b1bf761726590b8666331f0075d3c2b4f2
font_02_sfnt_off000141d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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