Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7726b8a586d2a6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 21:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c42ee35ce324d9f7931078132890d9b0 SHA-1: 515790cd8b47c1161a6f69697bc946076cb1791b SHA-256: ff7726b8a586d2a69057ca73e008979e26fe7ca2e15c5d915dac284dfc7e631c
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ML classifier strongly indicated maliciousness. The primary attack pattern observed is the creation of a link farm, likely to manipulate search engine rankings or distribute malicious payloads via these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867f8c622a4---kekaxogavupebejerap.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c989239e0---bixusuravinopad.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dr63o943h2doavbi4iv2mqrup0/jazowiwaperugu.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/2989475911.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a2eade52d---jawidokobijisimifelefigo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6db413e2e---manukesewu.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/todunimewuwu.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/joxap.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/98716461448.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/56306422267.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/tuluminu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be80324c990---24279305892.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/3841899956.pdfIn PDF document text
    • https://12waktu.com/contents//files/jupitedefidukitobitifide.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bb7bfae8---89252569775.pdfIn PDF document text
    • http://getem.plfiles/file/25889023861.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084208914dec---15754101450.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/82539166028.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/76318119001.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/17785837562.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/pawumatureboseza.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/48049698535.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/afb5632c9951b6dc54e4cf12ccc641c7/niveto.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/wolibarojef.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/suvaximexibuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2011+chevrolet+malibu+lt+owners+manualPDF 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_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 18576 bytes
SHA-256: 1a01e6d3069d9eaba93f6a190082c1bc3d153212478f6a5b33d0811e1bbe40d3
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11697 11084 bytes
SHA-256: 9c637eddbc80eb74e72cfad9959cbe6d6ad9c88c59fab2ded65721984e85f022

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