Malicious PDF — malware analysis report

Static analysis result for SHA-256 1accf0b9151e0a74…

MALICIOUS

PDF

90.8 KB Created: 2021-09-17 03:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8931aa9529dc2fe263a5ed7b8aef1cc SHA-1: 1aef914f4ab39d48282589ad31a2566c2285b60e SHA-256: 1accf0b9151e0a749c7a4bb2bfaddad09f268f5ab36e93eba1baa1bd78461348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=my+deleted+photo+recovery PDF link annotation
    • https://geloracinta.com/contents/files/33275142158.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab3e41146---dojagunezepul.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/moremoriwalaje.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/dalamujajijutosaxudak.pdfIn PDF document text
    • http://vecsecity.info/editor_up/25998043136.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0fb85756---lijipo.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/52139963924.pdfIn PDF document text
    • http://scantech3d.com/files/valufilavutejewigaze.pdfIn PDF document text
    • https://ibextrail.com/editor-images/jurux.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/64p3gochf1osquokjogeakjt04/68264042178.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/48562850925.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090504215027.pdfIn PDF document text
    • https://netlandschool.cl/files/welabene.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/95279094961.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/17d1eb04e2d6a75ab1cc4d91b1bf296d/46063731543.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/98468942006.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/43459940756.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/90f36e49c3b975242510408bcffd0215/57273456960.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/dalilopaji.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/bifuxaxu.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/48521661776.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_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 18516 bytes
SHA-256: 290aaca8ed7631330ffa3bc4d7156a23a28ec73af5ed8688f87d8d2ea9cfd19d
font_02_sfnt_off000146ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AC 10260 bytes
SHA-256: 0c98c883b76217c3ee765010e547d0f10bb0a27be372fb9d6f704186fc51b4ee