Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c7e133a9ddd5a3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 06:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7fa96555a380ce8a42540fb6e266f36 SHA-1: f99f7296ecf8b498708558935750410cdb9f9295 SHA-256: a6c7e133a9ddd5a3994c4c9403203d1a362ebfaf72d50119cac17236b5777d9b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of a campaign to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aviatroglo.fr/IMG/file/norijamila.pdf In PDF document text
    • http://bio86.fr/userfiles/fichiers/24828963164.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/laxurivufukikituzifonufa.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/zuvivenipojex.pdfIn PDF document text
    • http://df-2.de/images/daten/file/bupejimajim.pdfIn PDF document text
    • http://immopolignano.lu/images/wilanudixenelokabiwizip.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911052359.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/fevekinanurum.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/kojawedojib.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109190103231830.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/gifuxetobokazakex.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/60559833418.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/nitediwowibilofosujenepik.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/41222274233.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/guvutukeronas.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vadajewudepifesozux.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325fb389314---zanawidufigunabakimazatu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe15e8c3c---68354492332.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/mibifusemoga.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/zaxiwig.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131882751afa---xideporesosavitefebixe.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161315628221c8---64565787404.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/memezosefabufazuwumefed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=index+of+android+tv+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_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 10488 bytes
SHA-256: 72e0753afa80f43b847a5daaea11225593aa7bd2536e3393e6ed80fbc39207db
font_02_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 22804 bytes
SHA-256: 8652c3692043c1f179696cfc7b8c63a29c73c5403445880f13a2560a51ad5f4c

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