Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a248a982425b3c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 01:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c27513eadda7c4b7f31f706b9adcab8 SHA-1: 4e1a6fd064204509b48f8222cc62d3ea222cddb0 SHA-256: 35a248a982425b3ca8c3fb1d3017d4cea4e461e95989d6862f6ea84322f99d62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9686

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://joinvita.com/neu/userfiles/file/kidor.pdf In PDF document text
    • http://travelshops.pl/userfiles/file/96813225479.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/62147438316.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/82927680998.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613138597834f---felukopanudexixifivemira.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///57371898811.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/nedirilila.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/94816617073.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614389b869d11---witami.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/45554614656.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea975f3c01---25013834179.pdfIn PDF document text
    • https://securitydm.net/slicice/file/zagofi.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/tatunuzomidi.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121434236302.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/fezuvusubizadigavipifanu.pdfIn PDF document text
    • http://trevorhannant.com/97916371033.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303a7239106---nizetavofejifopab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430f54c576e---51229269148.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/xewewidedo.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/3885808069.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/lulunulosagemupedaja.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/xatazuxazodaposunonajazek.pdfIn PDF document text
    • https://phunhai.net/upload/files/41658920736.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/54117401935.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137f190ae5a4---linukolofujefi.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/dejirezanofujaxes.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/pitoguweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bubble+popper+apkPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC330 21924 bytes
SHA-256: 82842c51e1cc8a732ebacbaa862d84404ae2d7464d016cb392b67d9e6105a691
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 10168 bytes
SHA-256: 36391e73d73e84763681574ad100a55d4ab8ecb629d6ea03c13a32beb2f285aa
font_04_sfnt_off00012fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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