Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1b44587ab21a24…

MALICIOUS

PDF

86.1 KB Created: 2021-09-13 03:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a351860ff3426e9f18617587836f77b SHA-1: 28cf35d1ac52e6315f4a23b036fdb7c10968cc9c SHA-256: 5b1b44587ab21a241cbc4f65d225ae17f1898493a122b35795a5b6be8a29c88f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external resources, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://jpind.pl/userfiles/file/sunanul.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e95a7558cc---bulixivoguwinik.pdf
    • http://mxagproducts.com/upload/browse/file/79633682162.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/43bb352e259a38f721bb5575df093293/62904956911.pdf
    • http://lnaixi.com/userfiles/file/20210904160811_991604190.pdf
    • http://giasudaihocsupham.com/Images_upload/files/kesajinejanizixelijogi.pdf
    • https://photopoligrafic.ru/ckfinder/userfiles/files/28225653723.pdf
    • http://ferramentabelleggia.it/public/file/16908302544.pdf
    • http://dent-pro.cz/pic/file/42334050086.pdf
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/porikexuw.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c78e2dab9---jedizutemi.pdf
    • http://patronusalapitvany.hu/public_html/upload/sonako.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7a3de1c0736a4fc82ec55ba42101b59c/baxokuroxipimikudoramal.pdf
    • https://ingatlanfelugyelet.hu/uploads/file/muminilajepasoni.pdf
    • https://nikolsbeauty.com/webroot/f/uploads/file/18933243078.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/82bcbaa8a75804e2e36d2a06d63fab34/75403140895.pdf
    • http://gu-bo.cn/uploads/files/46313320749.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b71b47fb5---16743706768.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/5eef15701b3301bb6c5546e7c43079ac/wamanidozusofuj.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161336eeca7c3f---diwepasesaxew.pdf
    • http://abwcoliseum.com/uploads/files/8669330182.pdf
    • http://nandishoverseas.com/UserFiles/File/vamitozakubimud.pdf
    • http://zjgyuanhong.com/v15/Upload/file/202191033695884.pdf
    • http://mistral-paints.cz/userfiles/files/65390314005.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vortex+cloud+gaming+hack+apk+download
    • 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_off0000e7a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 16792 bytes
font_01_sfnt_off0000ffba.bin
b0fd23e671a6b6c3c2d425536925b00a68459c6bb7e9066a88fad9a8df844540
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 18136 bytes
font_02_sfnt_off00012f2b.bin
b519b413e118e702e749288548990e0d3b8bdfc1cc8f1261c8476deb06978ba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 11140 bytes