Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dad5fa6f75c2a9…

MALICIOUS

PDF

93.7 KB Created: 2021-06-25 21:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a62a0359f95ee1f61a696fb58c18136a SHA-1: 67bf2a249620ca38e77b54b96a22a92ad298f0eb SHA-256: 88dad5fa6f75c2a9624c6a6a65a2821ef9e13dbe966c88c035e34f37c954ef01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/713a28cb8c928d477002d00678eec0da/1573881600.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9773d5536e---17452373981.pdf
    • http://alkanboya.com/files/file///fotazuburotodedelifumo.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827c7f45e9f---zavisipinefijudikomokavoz.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d512da6ddcf---mumatejuja.pdf
    • http://hsiwww.com/image/files/20210621_220945.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/87339596527.pdf
    • http://botosani.ro/img/uploads/file/kamibagosutodenutixaj.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/6683458501.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ab089688a5431adb6c44bf295bf1f883/1347812888.pdf
    • https://tepihtrava.rs//files/dopuvudumugiv.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e55ce63c3---xozotomolesoreb.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/q5b4ih3inpunm7p8jhurbpkq6l/jilodufufujalo.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e11c78a76638bfd055918c943de2e7ca/6982248633.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8d8b2bf0df09cfdba02409b5c0ae3386/68525788123.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ee59beedfbfb33a98bfb154afe9705de/90143977853.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0229b74d74b43a634f0f0eba5d2883dd/95298158018.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/siodpdf9vej4uudjkdvi88mpk7/74420652519.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/suwunuwonivob.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eimr6t0o1o2prk2pk63p8uhp1a/xawiradifudavidafag.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c26e1f004---63397344738.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3734aea6e---xugovesirelafok.pdf
    • https://baobihungphu.com/media/ftp/file/95791213277.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607371ef5200b---bovozumizetevuvowuradajep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=leg+and+glute+strengthening+exercises
    • 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_off00011028.bin
a6e0abd795c09d7c78909c73d030a92e049ba587838a58b8b74f3c1343ac3033
pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 10688 bytes
font_01_sfnt_off00012862.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 16792 bytes
font_02_sfnt_off00014074.bin
ca53471c466c45a7a8772ab72f7963d52768cf7002a7f8fa270bcb091aebd91a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14074 15856 bytes