Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca209da7e3fd17c2…

MALICIOUS

PDF

71.6 KB Created: 2021-08-29 21:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0e2cd34bda0eb74d7faf5eee549799a SHA-1: adaf3390eefe22fdedaf8d4839bf86e3d48b2af2 SHA-256: ca209da7e3fd17c2a236ddebfb9445389e6d353b74ec928e7cae3d9fe0b7f29f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm directing to multiple domains, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and link farm heuristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ahjygjg.com/upload_fck/file/2021-8-22/20210822061728586842.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/696ffd07285a70dd14beff20844fd8b7/78471123230.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/sezapaxiwadikerubimejo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97e3057d3---dajibewikomipore.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083262ac0563---patitobotamukidakunub.pdfIn PDF document text
    • https://luminex.pl/upload/file/8779728686.pdfIn PDF document text
    • https://hagepoorter.be/files/files/xetetufagobokewifinikip.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9bf6d983---29908203383.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/83737795883.pdfIn PDF document text
    • http://nessium.net/userfiles/file/41857243683.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zupuvurukugas.pdfIn PDF document text
    • http://zae.me/datafiles/file/kenupewewevikew.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/3l9j2sj4bv725vu26ffnakdtpb/5806827262.pdfIn PDF document text
    • https://senhewood.com/d/files/nolakafu.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/44934193512.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d1f262cb8465c619485e61ea8889d5b1/32984159956.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/zobepupagituzun.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e56f150f---sukuvapufadepuxitas.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f6713178---pogumijunijejonobanam.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/81e6e359ffab64760ef39f16e898302d/72899860727.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fl0596ml22nbdot4mu9ii0a5f5/52317882524.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/foseju.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612bac2e68058---15730159514.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=alone+without+friends+quotesPDF 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_off0000b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 17036 bytes
SHA-256: 605a1780a0c18198c02adc096415b94999207a17127ad032038140c33ab1174a
font_01_sfnt_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10600 bytes
SHA-256: 51c5acfe4410abf933728e979f8ebc38c8c4ad63d485dc21d96640e4ad8a5d7f

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