Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1cee7f90c83349…

MALICIOUS

PDF

86.4 KB Created: 2021-07-02 10:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38cf67af63c2cdb00bffdc87bb42fb3e SHA-1: 6b2a65b2446031be71728334eadaef8b5bebebca SHA-256: 0c1cee7f90c83349860d8d1c4341861f889ff80a576bb9fbba36a6a01e7ed724
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link farm designed for malicious redirection. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/d44a04b949eb7e7509b8e2c1e7ebb17d/15230935319.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/393da5cd932645a9a94b47d88de0c5f4/61564836256.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/80876544429.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/biluzuvekite.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/83407909376.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/pitowepemedijezivo.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/68210178739.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f64eab427ebf9701d5ddbf198c7041c4/78327141410.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/44953640224.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf414fd60---11108304466.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xofopijafosezivegufix.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c953f05aae8---butezavuvafesixomupaluge.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/58f5aad7ef211845119214ae3908d9f8/13431640230.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079791b92e08---17445626136.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/67570097076.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/756800586.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6368a27c61---pewusozojefo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb8f6be78---27093372630.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gapipurexo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/49f7f348653d9e8a4bd4620fbec29804/rorudote.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/561035509.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/72868655993.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e58eded8c3---40034427596.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1813e8b1fcb24300650cf81ba2cdc908/26271545351.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b63f7f95ae6---98173736309.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/fexaf.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/vozuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=great+brook+sugarhousePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 10516 bytes
SHA-256: 3c93efe4a57933d5426556a2c0e993e48b31d6b9d28ac5df2dffa6a9652153a6
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 16804 bytes
SHA-256: 26137e38873f08c2fb54371148b51ae5224bd84b905e70c6c1e047a8e0073ad5