Malicious PDF — malware analysis report

Static analysis result for SHA-256 85db237bd2558dda…

MALICIOUS

PDF

87.2 KB Created: 2021-07-22 10:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 308b8be97cbabfb98e95311077dd3587 SHA-1: 34e07d4adcedcce09b339396d81af5543afb0e48 SHA-256: 85db237bd2558dda94227a04ad9071d0eca11ded2e936f7d5bdaff47de3dc886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/987b053f581af6f3cb6ed1392dbed733/maredegoza.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/aef5412c8c8c485ea88410ea475e7a5f/wisemaridagixipajix.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730ad421bd3---sojez.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608350a42ba29---juzukoxuko.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e48bcb39891a4dc61093d44da93b26ae/baworu.pdf
    • https://myphambambi.com/webroot/img/files/58371814765.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec1b0406d1---javodebevutaruw.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/74f2c63f56f523b49d7a12493bca874b/13173200602.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/71231507464.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0c9889450572da44367b40e4c9c97aa2/72065626964.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/656862218be91cd1f6fe98416e8f5dac/26591200440.pdf
    • https://bedandbreakfastchia.it/userfiles/file/80250187716.pdf
    • http://mopron.ru/upload/files/zosazajogifumadu.pdf
    • http://bartuceviri.com/userfiles/file/manadufuwibimebi.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b249bc063df---wopexu.pdf
    • https://tenfci.org/userfiles/file/81622530271.pdf
    • http://accessoriesunlimitedinc.net/catalog/file/zubukuj.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/802aec0922538a64988183afd2c31a14/talubelomizikizotugijeto.pdf
    • http://royalwedding.jp/images/blog//file/37504733057.pdf
    • http://piqiso.ru/userfiles/file/woxafugivimusezi.pdf
    • http://epoxidice.ro/mm/file/pelifinafozopevuwela.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/shd07o8aooatd39o9ilguaqgm4/kupabuxokebepi.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cfb2e49c---sifosam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=choose+your+story+apk
    • 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_off0000ede3.bin
fb3c36fec5bc300b6e842eb70c6d677cecc13fb7c7978f4dfb575ef7f691a737
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 19232 bytes
font_01_sfnt_off00011d95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 16792 bytes
font_02_sfnt_off000135ac.bin
42557d27ed2801af509bd0cd5b58f76f96a0c0193905ff90bb6df257eab5a710
pdf-font-stream PDF embedded font (sfnt) at offset 0x135AC 10444 bytes