Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53d770886f178c8…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 04:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18e1ce8d828b5870b773316c2056a723 SHA-1: 98711f2585b1550ed36bf9f7d931d31b73d87a7d SHA-256: a53d770886f178c836bfb26bc8f9cc70f333b04e776a5555d76f5bc399725820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious 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://pistant.ru/uplcv?utm_term=do+you+need+to+reapply+for+student+finance+every+year
    • http://exosportsante.fr/ckfinder/userfiles/files/85023065671.pdf
    • http://hzdsbg.com/uploadfile/1621426727.pdf
    • http://bafiti.com/sklep/userfiles/file/zabimiru.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sjskftu20jhvsmq7ckdb2ji5o6/dulerojamuboxobiruv.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aedb18080e---molujuwaruxe.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ff07f3e4ad2596cd1b9265d179c9fef6/penitagosa.pdf
    • http://cbgnfinance.com/userfiles/file/46820726347.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d8a3e34190d1b4409e0b9c06769784a0/48125610601.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdc2c3ff2c---sikogo.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48d05e466---dedufizugopasutekaxode.pdf
    • http://ylplj.com/ckfinder/userfiles/files/93752079530.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba38001157d---rogusizaxatedo.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/nehsvqesqrnmj5q802fp6odrl7/mogigugewanemaguf.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/hircsffu8bp5j7monhm3o4agos/luvaduxarevunogi.pdf
    • http://alexandercdg.com/clients/36029/File/vidalasawepogisu.pdf
    • https://davidfoleyinc.com/userfiles/file/lavide.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23f3b2883d---delisowamijevula.pdf
    • http://bbu.vn/Images_upload/files/63647674489.pdf
    • http://ackerviewguesthouse.com/userfiles/file/43587976525.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b4be513b7bcf78907570be1fae004904/69724277582.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160769b3d190e1---13343805499.pdf
    • https://xo-sound.ru/userfiles/file/99732785979.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/57613773058.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010adf.bin
0daa0b90f3179ee455fdf549f0a714e0b6273ec9d81037a7d01b213a9ca70331
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 10892 bytes
font_01_sfnt_off0001243d.bin
63028aa175132661b39cc7e3f9480aeec065dc498e2c8ab7fc0481471bf0de72
pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 17084 bytes
font_02_sfnt_off0001511d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1511D 16792 bytes