Malicious PDF — malware analysis report

Static analysis result for SHA-256 510009a3a3f86655…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 22:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b29d57b3ec63a68e51f98d140a160c45 SHA-1: 94905b23b550ad9ef94996b288352a48a68352e5 SHA-256: 510009a3a3f86655b9b62c1cacefec9e0c1834575852b9650468e0281ab31f19
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm strategy hosted on disposable domains or compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' indicates a lure for downloading, reinforcing the phishing and download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=lightroom+unlocked+version+apk PDF link annotation
    • http://shceping.com/upFile/photos/2021-9/file/35585864816.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/14118311758.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/waleporisatak.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/nojubaralewirewu.pdfIn PDF document text
    • http://hanifeugur.com/image/files/46235899151.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/14051319326.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/dofirobunejugijuferuxezo.pdfIn PDF document text
    • http://ktcz.eu/files/files/62363736826.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/90021425403.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/17715594549.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/19919317923.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e677a653f---31704789224.pdfIn PDF document text
    • https://digireg.li/upload/38838402449.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/renukinuvimarobuv.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/78845663955.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/sudoneno.pdfIn PDF document text
    • https://fratellifurloni.it/file/gadojosutuvomusakudofoxo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1f46d0e8007221ab4295d7ada192131f/75552593075.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wuvemewotejugo.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/rodupegadalapazari.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/tanixe.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/jamavopo.pdfIn PDF document text
    • http://intersonik.eu/upload/files/jiwem.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/laxigij.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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 11176 bytes
SHA-256: d9bf7d06450ab941a2d75d865bd869c8a3af655eb84a72c975946be4657a0320
font_02_sfnt_off000117f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F1 17260 bytes
SHA-256: 71cc5bba3ae18a4fc2d03067dc0eaabcee613123be3d8203dd5aa3b1b2eeda20