Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07555f1ae950d3d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 10:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88a851ac435e2a717846c3e30a4dbf28 SHA-1: 1a88c56cbae44b01d8c02650c66c10e1e9a7a8fa SHA-256: c07555f1ae950d3d8548c46d9af5e7e37c032b586f339e0e336c593aa27e0b7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, likely intended to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/goln18q5s44kjl24u10dn493eg/43180231682.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146766d8f669---rukibujosovilonenajizup.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/fatipebepakuxosofimikaz.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210920022348.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/muzavasagavuneviwavid.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/saxujujajewuvifozog.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5d69c703f---79554819260.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/xozur.pdfIn PDF document text
    • https://avukat.kocgrafik.net/upload/files/58726503167.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/99744173898.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/xesukidodomesin.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/mesuzol.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/kozorezitaj.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/sakumewu.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/95574733035.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/6225111376.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/wakirunewefidunud.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/25376813142.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/46704916913.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109051653286952.pdfIn PDF document text
    • http://juicy-group.com/editor_upload_image/file/79955503955.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/ravatezapoxaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=joystick+gps+apkPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/75663318263.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_off0000be3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3F 17876 bytes
SHA-256: 2adea31c28d340931f9721f7fb29e6e45ac4b830e1b4808abb3e1eb36e34e77a
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 10364 bytes
SHA-256: 07c1c657596c5f161f4eff90c0997f3bdd6cb6726fe7d5766f8abbe97e0fa81a
font_02_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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