Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d467f6f4c853771…

MALICIOUS

PDF

79.9 KB Created: 2021-10-14 05:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ccead010eaccba30f658078a4c740eea SHA-1: c7e3aa4662d5cf1f3b17b35db70f71ea24281958 SHA-256: 3d467f6f4c853771f8872007d8c9282f7043cf0f40d77e015d8b3d88aa3c2667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The file functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alwaysthesame.pt/site/upload/file/pewisiminerezasosum.pdf In PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42627209182.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/97578099601.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/73606037207.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/difarapiwaweluj.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/dudug.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/30283670546.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1616594455fde9---toweravutoxado.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156e97ad8928---72055915905.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615866e5312f2---67119157337.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/96978284301.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/nukup.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bedoxataw.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/lutabepajowatalarexexal.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/puwekeronivu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155ba3d9ae7d---zozuxetob.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///xinorupefonib.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/80334541522.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/boderaxibuneposiwa.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/buvoxidorujavoga.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/25652565887.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/75pebgi4mhm350tilvqhc3omgv/63003311786.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/xujulefibuna.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/69346016667.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=fashion+doll+coloring+pagesPDF 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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 10672 bytes
SHA-256: e5dbef2825186dcb4d234edd4d2b7814b92985d8d7f243497c236007519e14b3
font_02_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 17740 bytes
SHA-256: d7571fc2abd53ff2394b7511d549981420be8fbbb905045deee979850c8e3ef2