Malicious PDF — malware analysis report

Static analysis result for SHA-256 12963db454c8a8d5…

MALICIOUS

PDF

80.1 KB Created: 2021-07-02 07:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d25046159dfd8fb142548b5432e9239 SHA-1: dd2289b5f40eac99d6357485ace63dbb3a9c3d21 SHA-256: 12963db454c8a8d5536adb4130adb28371c77d3907274f541fc1221c4b002531
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The embedded JavaScript likely facilitates the redirection or execution of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://oniceh.ru/uplcv?utm_term=lake+county+homes+for+sale
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5f1273ac8e247c04770f1f09255d8508/volizupowonujuloronejud.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02e6a0ff2---74523410376.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cc1b038d5a9cceaa727d5cf1d6218ddc/tikokaro.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/mudolevegufuzivagonera.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b08fde2556d---54951505633.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092345fe81eb---jexejixazeletebexamavex.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/63a4dac5ee9f266cf828f2891c392c5c/filiso.pdf
    • http://darec.sk/files/files/30644495065.pdf
    • https://villadorottya.hu/uploads/frontend/files/bareromizevenij.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7004f170c---33366376313.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddb447720e---37647076206.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607257e4b6698---zakavakugovopirom.pdf
    • https://autoparkalbanese.it/file/pimipaled.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afec3f2be15---77418301936.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/1j8put3for38gijutgpnbc4ht3/dukosatutunavuvipu.pdf
    • http://sjar-tech.com/uploadfile/file///2021062406094126.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/rjmqqj7tnpua3bdlfmrlmbql8b/bolajejudafu.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/e9bd39daa5888c01aa700e7807944058/pazaxarux.pdf
    • http://shadesvalleymounties1969.com/clients/868959/File/sujanisifasojaxevedudo.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160847d7a5ee0d---56611517981.pdf
    • http://sincaremedicaltour.com/js/upload/78281471266.pdf
    • https://mobilieroccasion.fr/uploads/file/dekobasosumojufakasevedil.pdf
    • http://amdind.com/userfiles/file/vaxuxer.pdf
    • http://casaatlantida.com/userfiles/file///89810700827.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ea6d5718---pemosagofajifusur.pdf
    • http://ipublicity.cz/data/file/mesuresigijiwudoxipe.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c778c556bac2175e1e11980479e7da39/62752302996.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_off0000d631.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 16792 bytes
font_01_sfnt_off0000ee48.bin
0a705fda1e2c0abe013b38200c85bb11906401795cb2e7850244266ad7faa270		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 10772 bytes
font_02_sfnt_off000106f5.bin
7d0d42cd61a1663b218c3f94ccaee391ca33134255cdd2d3bb29d5fce82e8082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 17156 bytes

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