Malicious PDF — malware analysis report

Static analysis result for SHA-256 7146c7d77185264d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 05:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8276e057cc6d921569085b30ebb8c942 SHA-1: cc99987d4c2171f8df3ad705cad401bfef296aae SHA-256: 7146c7d77185264d28317723c6a3b18d90dc6cd1b3107a95fbc52218737d96bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. Heuristics indicate these links are likely used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182a55ca5e---zanexajapazad.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q7ouj6dmmvqstovdjaqbrqf2l7/38812283340.pdfIn PDF document text
    • http://teplospectr.ru/images/files/81322853654.pdfIn PDF document text
    • http://banquat.com/userfiles/files/90770243947.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8a0e14fbbf9e5c944aca7335f5dd50a0/13515757075.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/28782862262.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/15274533488.pdfIn PDF document text
    • http://okvin.org/userfiles/file/watosamizavofugozufe.pdfIn PDF document text
    • http://sentai.cc/data/file/20210917_084829_498.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/wonedujagupupikukarug.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gavenibaxibefazevona.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/punudalenifula.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-17/20210917084659155697.pdfIn PDF document text
    • http://keitbg.com/images/files/dulidadi.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufoxipusozetige.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/fipetatijazogaxofokovi.pdfIn PDF document text
    • http://labonscafe.com/userfiles/69354618605.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/sipesakaru.pdfIn PDF document text
    • http://candientushinko.com/images/file/63142056097.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/mupogonezelaxireli.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/jozowokafedokebimebuzame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=s20+launcher+pro+mod+apkPDF 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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 10932 bytes
SHA-256: 9e80c9cff0ced97f0518db0b6fc2565ef2cc559fb1d0539e7090b34373cdc356
font_02_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 16972 bytes
SHA-256: 6cc8d2b61aebe59216a794f3a73c7cdbc3f462d222b8712533ad5ca7d3f977eb