Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a93d50497c0f25a…

MALICIOUS

PDF

89.7 KB Created: 2021-08-16 10:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a155a8a1e65ab68f6199d0b4fd4b55a9 SHA-1: a630570300ebc93ed604f6b4cbfdb3d5f40ba1fb SHA-256: 0a93d50497c0f25a52ed3040c6203234087072679085bd83ed81ebacd39d5ff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious files. The presence of numerous unknown URLs further supports this, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961d054e5d3---kuluvewefiv.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ca9d425fc1dae1d310765f29530cb98a/zomivefekotuduvog.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/sovetepunoti.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/k6gonu2o3j613hfoc6rcsus463/jusavokota.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d640f5a80493106feb69e7237e0f2a52/fijoromobewixu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/41003579626.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/52f4d5212ad8918aabed7f5aea6eb0fd/22211436438.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4e9ca8d4ba05ec051bcc5f4a77add25e/nusigikom.pdfIn PDF document text
    • http://traviet36.com/upload/files/48108026154.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/duruvamamu.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/1528285526.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e2e055fd---74905457526.pdfIn PDF document text
    • http://uci.ir/userfiles/file/momabijokezomunalewavuk.pdfIn PDF document text
    • https://abeess.com/userfiles/file/32796680259.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ueue9md07h866c823utsv0010n/rezivas.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/83416321561.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d874acbcf---guwatuk.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/jovejebagodowudu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe309c2d2b---javutekixivetezogodava.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/79221311348.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xuxusitikuvelizoxiginareb.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/jiwofevu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c4468288f---misodefob.pdfIn PDF document text
    • http://domplus.su/userfiles/files/26270300503.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c5c77b4d4---rovefukowulozas.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3c0e2409---52752491311.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/kiginukiniferovawod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=descargar+clash+royale+para+pc+windows+7+32+bitsPDF 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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 11476 bytes
SHA-256: 82935f0da951365e03ef7b1b85c9f2b0fd0246d437c82ce9b9afe7137a79f19d
font_02_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 21780 bytes
SHA-256: 4926988ca1fde0ce2869c994e2c652a6425825bc2abb534380834ed34542d4bb