Malicious PDF — malware analysis report

Static analysis result for SHA-256 19635388cb343aff…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 00:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a128c0e05c6c02d0e63fdc01219d4b99 SHA-1: d315aecb12f4161334aa3c19ee63925ea7753f77 SHA-256: 19635388cb343affcac0ed57bd6277962f82b7b6f55fafdab08a2e253f7340ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, some of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=verb+tenses+worksheet+for+grade+3 PDF link annotation
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/goxapogipixevogafaxedem.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/78244009718.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/digegawonera.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c503dd89da1---94816846379.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0b3f89a9b687416d1a3f12e888252673/wupovixuxupubimo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd9020b1b---7223484950.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/datoderazumukizapiv.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/77613c783df58d985ab10c142efdf671/85689881967.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/zuzoxinodowir.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/tanexarujufiv.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/32ooisbleonmnagrr75tu833vk/femutatevakasatajubesozax.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/muzanawaja.pdfIn PDF document text
    • http://iucecb.com/files/file/24747059801.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/zinegudipivuvifiloda.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/76041336186.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/a70c0vedbn1pokmotjg2dj45n2/xavafazadogividufeluroki.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e650310be8---38223414164.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0eefd8f804294090512fbdc0bd9edc51/pafiva.pdfIn PDF document text
    • http://ciskmv.com/css/file/25537381480.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0dcfp1cp2ss4ep6jjjat9k8n8k/52717538139.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/17140414336.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_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 10956 bytes
SHA-256: 4f7e182c43931e8aad22cb2b0e57daaf7592d056bce97307cfa9c20202b87fe9
font_01_sfnt_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 17024 bytes
SHA-256: 2d2e710ba8e92c9316c56eddd027d766536e56e2c485f350eec07d17a0e0f1b8
font_02_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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