Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ce0e67469ec77a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 11:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efb861cda517b1a9e67fde7731c436ef SHA-1: f7b86d1875bb7621f99120c87fdfbb4337a6221b SHA-256: e1ce0e67469ec77a34ee84da9c28f1035b80549dd02bf9cf87fd6d27644e38f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=crazy+rich+asians+online+free PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09dba6ca0---mipaxebogekoji.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/fetit.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8ba978c7c56539352165a27b99736ca5/nasenuzodiv.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/moxokugejuvaxutajisibosir.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/zuxezavetokefe.pdfIn PDF document text
    • https://themalc.org/files/file/93869569957.pdfIn PDF document text
    • http://asfalon.com/__files/file/vevetozopuxetetaguj.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/52195268227.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/xutafuxozerifufufitupuf.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6095033f584170a73041ac2f99cbacc/48410994169.pdfIn PDF document text
    • https://ismart99.net/upload/files/62746797355.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/67349982293.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/76949167180.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090122033560260.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bizifadexisupuru.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/66019104478.pdfIn PDF document text
    • http://chemsdano.com/upload/files/dorojafagiledag.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/46240619249.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/tomexujevif.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/purifilobuvad.pdfIn PDF document text
    • http://compsult.net/userfiles/file/muledejazumo.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/xijujimuzi.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/bojidagawigev.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/84237774370.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_off0000b7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BA 10540 bytes
SHA-256: 190079f755e9d1e8346442544475b27038a0a8e0bc52295fb15b92b02298ab38
font_01_sfnt_off0000cfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 17196 bytes
SHA-256: 12debb12d853d55d02b67a7b42f8ab5582890dbda27304eff1b643ecb31a8199