Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b7923fb96ed09f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 11:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68246abca713365d3b2da19c46653c2c SHA-1: 72d3a7d71a26a6cb76798f8185f15bfbc9ec82c2 SHA-256: 63b7923fb96ed09f7edcc4b043f1b67fff7d7ea16db405142da1399d7d7ee41f
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 part of a link farm hosted on disposable or compromised domains. 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 0.9963

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://pixomot.ru/uplcv?utm_term=idm+6.38+build+9+crack PDF link annotation
    • https://floridagreatescape.com/media/file/bitofapixaroxu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161423fc1511a8---79484698714.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/lizivolenitexasewudu.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/15494955368.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/26310576711.pdfIn PDF document text
    • http://aa-nusd.jp/49044940429.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/zadom.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210904_A283A464E6104F0D.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/90073292910.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/mijazukovekakirasuvasenol.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5116bf8516069309abb8ff2735d9d1d6/47937504542.pdfIn PDF document text
    • http://belniig.by/public/file/7454133932.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/73901041572.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/gibavinukikap.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/supapufifosuramoputazu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8acde6ce4f365e3f626ae9949f4bb4c8/vowud.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/vodajubafakaroxa.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/48757352578.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134098a534d6---30482112675.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/31554273470.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/voludemizex.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/kevurawa.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_off0000c3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 10976 bytes
SHA-256: 527a5c0605c1aee865c49ee42d9102153154d925c57fc27087489b7f22a9f898
font_02_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 17424 bytes
SHA-256: 5eea196bd0acbfe3215cb7f7dda769b24f4a46df58275a8e3ef133d06ea5dddd