Malicious PDF — malware analysis report

Static analysis result for SHA-256 a063ae29936cc2f5…

MALICIOUS

PDF

71.4 KB Created: 2021-09-07 22:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f96fcddd3c91b7e408e44ab573de828d SHA-1: 90dac1556674a857612a156b40648a31050afd72 SHA-256: a063ae29936cc2f52ed1fb56e7ee667d4a90aa69718e0dbc2e86d36bb070c141
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=collections+in+java+interview+questions+pdf PDF link annotation
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871dd806e58---zivewa.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/75657649067a1310f46d8852c37db671/bosuxule.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bejijojogonarer.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/312736ffdd945abf33dd2d65ad4b99e9/56805924331.pdfIn PDF document text
    • http://jorakaygame.com/ckfinder/userfiles/files/puborujurojunaxo.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/semorevimakuxotatilivuf.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/67573108250.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7111f97526353e376ce526a41b39cb00/miwomesemawekapalif.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/nojoxejasenotogiduba.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160facd27d7b05---34965976539.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/depuwimizasumemogilif.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/juvubedinajibuxorazas.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0182a3f3d---voreliberoze.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/xubugazitakuvek.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1611aae900367b---mudujana.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/48700769881.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/jizil.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/49093347678.pdfIn PDF document text
    • https://aitalk.vn/upload/files/81313891452.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/0fpm7jdja92ndvm0m9g39kn6td/faxufabivatekebalemibinep.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/seravegenivakumawaxemes.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/20644231884.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/53naul22apsuuq43fe2nk9ajq3/tebuke.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b65818924---zejelefumezef.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_off0000b754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB754 15192 bytes
SHA-256: aa12c72ad3a4bbe2925b58207bd2d9b471e013cc0fb9129d8e9a9e7820b0f071
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 11172 bytes
SHA-256: 48847d542b523427cdac5b39170998824ebd4056b891c98e8984e8bd7787d13a
font_02_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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