Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32d8cbb0df5b0b3…

MALICIOUS

PDF

85.7 KB Created: 2021-08-31 05:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c186d6e18321ca153cc84451db01bb0f SHA-1: b1037718a1690cedbaa303ade6db31e8fc028ab5 SHA-256: f32d8cbb0df5b0b33c4236152c57ae9add5c49378c48bbb4c41ba7246edf1849
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://smidgel.ru/uplcv?utm_term=parable+of+the+sower+hyperempathy+quotes PDF link annotation
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2e189501---kirusibadejifogezu.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/wisamabodapabonuwu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b783a71a---disuzuf.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0d937867831a0a3ed45f3d971bb78e38/belevezopotiveva.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/2531707545.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/mepig.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160743c6a3bef4---fijunurujuxikowevisiviz.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6cca313cd7ca3c0cdad538dca7f726f1/bipigud.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c694703c5a---bunepuxesiguronovifojov.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c8fcb8174296d33aa05cbb125d675470/bolupugiza.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160729fd06c131---fogalunimonomeb.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/dimev.pdfIn PDF document text
    • https://cape-electronics.com/media/file/49665845090.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/fivenazizozipedazomezamib.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/bezezunowujulugenusipibe.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/80711208515.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/lifujoxoxupulawunubogat.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/da35296179f33cdf6af77666b2a72584/tavabufakanenubi.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/boxikejevopefiwabumuxoge.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/18888960106.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/5868236632.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/pupopotevexoxefakeke.pdfIn PDF document text
    • https://cubic.is/userfiles/file/90903300553.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/80610842190.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/futokumabokubope.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/ginunabatajeruw.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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 11012 bytes
SHA-256: d45f23c94399b313ac7ea256d28f370586c5648e189208eb19428a6d928b13cf
font_02_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 17328 bytes
SHA-256: 4a10d47c94b9835b37846668f86e6a77fa3f42e7b4181dbbb901e96e271e2149

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