Malicious PDF — malware analysis report

Static analysis result for SHA-256 40702e4f7ce1521d…

MALICIOUS

PDF

81.8 KB Created: 2021-08-19 03:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c73627ab915633c292e2476710b0024 SHA-1: 2e262bd2e1068da82503ba86951e1270790bfddb SHA-256: 40702e4f7ce1521d19e2c1f1b43cb1ca1dda4887cfc56d293348947895852ea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or utilize WordPress upload vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple link farms suggests a broad attempt to lure victims through various compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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=benedictine+daily+prayer+a+short+breviary+pdf PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160943c1c84336---33144248148.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/gotivuzejesigaxuw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50a66bca03---setikug.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/77761498972.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16090c372a383a---56518353582.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/fakotarunokujurilujun.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b56bc0dbd7c---soworifuwogibitofuka.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/gudipotowitivizar.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/31e187212ef6aaddb1ed0afc9cc471a4/72449142702.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b604f19a35c---32452571054.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/nalexu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd81082f14b---72409095994.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e923e3c33---kivobudubalalerobeb.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/jodoremevumojul.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609115eac48c6---vidofebenisulewemu.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/41014624760.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/parovevimumaxikulemoze.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/jesitedi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/he9viqjo6h3qquk6f7mfsgth90/52611596289.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/95034438358.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaccd3d6d92---rejuluxonudamenamosu.pdfIn PDF document text
    • http://rld-carbon.ru/file/60953329145.pdfIn PDF document text
    • http://aven.su/userfiles/file/50987719211.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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 11092 bytes
SHA-256: 55f139cae6caa1b92b5374e31be184770ce52ca8fb9a928c7b2c386ad6cdff88
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 17712 bytes
SHA-256: 424e0374bf789969b981678016d43448a9f59802f939a18db0a91c0c8dbf188f
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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