Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b5de388b17cae5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 08:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5af4f4dbf930d70a5ef1ac2277551e4 SHA-1: ab467c92c86b4be539ef9433f175c54cfbb35180 SHA-256: 57b5de388b17cae5e1bb3649595b36499094aa8a2c64cf41c9beeb8fa109976a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS upload storage, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130040931fac---tufupazefiremefewinog.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16143619612836---lawenizi.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/35123428725.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/31736175917.pdfIn PDF document text
    • http://deltools.com/userfiles/file/12857265225.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/77022692464.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/kagozitubigilagowerenaka.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gasetawasoxadux.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/zizoreguxoriwepuf.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/minepamajudiviluzibivoxop.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e14eb3d098e5cf2228ae6bdaa5501d66/29246363549.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161402cd0033f4---jekipivotixarewepikejuwiw.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/maxuketevi.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/29888215680.pdfIn PDF document text
    • http://xn--c1ajalgzu0a.xn--p1ai/userfiles/file/baviwesupemifosawupolak.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/77842931677.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/47293346617.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/58645519252.pdfIn PDF document text
    • http://sin-hua.org/userfiles/tojeke.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/58140758601.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/puwetoxixawoj.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/92514230045.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8f2cee9dd37acc5e3aaabd51e64b9eb9/zivunijiboru.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/20971610180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=blocky+farm+modPDF 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_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 10300 bytes
SHA-256: 2ccc5c593162ec409daac12ff32e86eadb368f101fd018efa81445caa1da44e5
font_01_sfnt_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 20036 bytes
SHA-256: b9aaff64743f9f5ed9834b3ac64c4d770ce2472e770a9f3069fe0efb076cc7e5

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