Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7123936a31eda9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-02 00:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 924c3afb91df389ed71b8a980c02f392 SHA-1: 9e299470540e4fcf6ceb5c9d3022644353a8f900 SHA-256: 5e7123936a31eda91dc291b75bd40f4bbf24780a5f9a8e8360270f567295e6f3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, designed to resemble a download button. Multiple embedded URLs point to potentially compromised CMS uploads and link farms, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://poolpoint.be/uploads/file/70665410851.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af62d7bf892---fipefuwodorefinozuj.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/xozojumuketefisixej.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/14237744766.pdfIn PDF document text
    • https://bataretak.com/img/files/file/devefizejadiwidalimes.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c4411c694ea88e0370c4c94551be75af/tagegugoto.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c7b65ef563e8f24dc3f0547830a2ba15/kafetunisobufujazaxeduxu.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/34619103034.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/4agm02ip7p3n9a9h5j9grmm1li/kakopolesutojezusan.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/23823148057.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/55094717862.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/tagube.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0u94ekaeau4a61mo9mghu2t6ig/23733824900.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sumulufixuzuk.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/jamolaximipus.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d634789b---makex.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/veguwu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de45028f1---24935644700.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/nasisakuxuseloji.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/zagizu.pdfIn PDF document text
    • https://area5srl.it/file/bupuwunutatuvarizoneg.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/wisimiduvubigatuwelut.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/68789011112.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/90131163483.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/visibamamuvewora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fun+royale+clash+royale+private+server+downloadPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d7c075ed12dd93ab3a34fd7f313051af/luvajodikebeluki.pdfIn PDF document text
    • 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_off0000b224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB224 14364 bytes
SHA-256: 2f107e1395b0a31b69e292a33395d04fe9ee8c1be1a360cd2751bec0975ff876
font_01_sfnt_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 10956 bytes
SHA-256: c6b421e89db0e080deb151758972a5706cf20fe032b10a8a80f04a02bcc07966
font_02_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1