Malicious PDF — malware analysis report

Static analysis result for SHA-256 616ed9022c520aba…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 17:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b0427a3ee2cbcd1655fc5523c464eff SHA-1: 7fd560f25798329532f2ed3c99694f06cdd9d5ec SHA-256: 616ed9022c520abac61c774b7db3e093b69068b16ee5c19c28b983a1798f7dab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=old+phone+ringtone+for+android PDF link annotation
    • http://ctcinsulator.com/uploads/file/zakabakagilubix.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/49782147169.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/zanexabesedokofipusiw.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630645738.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/rilalezikigizolovadu.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/beruvidoxodovimadigowugow.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jikijelodevikijexepis.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/rasivuvupamunari.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/jepimulowasexizaxesujapo.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vudaxikusefaligulif.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fqqmrmimltflptlli98g0184v1/79058740055.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/fimibufidaxirodarimopisu.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/59929502980.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/woxori.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91485802725.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/96233604616.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/83203360853.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/36766487547.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/65370330616.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e682b70882---79600280817.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/38401650711.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/mumoruposiwavujiliv.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/xonerawovopadoxajo.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/57370945932.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_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 10636 bytes
SHA-256: 6051372be25fd27f035b0131ccba093c836a3cd78fce00617b54d3a18ad27b73
font_01_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 17832 bytes
SHA-256: def0ef90d1fc31bcdf93e2ba0c8b501cdd5aab9aa5eea014aac6ee04bcc7ec10
font_02_sfnt_off000130ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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