Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b95a406d536cde…

MALICIOUS

PDF

90.4 KB Created: 2021-09-18 14:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86195f3e62a3bf1854b400d3e25028f9 SHA-1: 95c1e8c55c9d00ab7d0c069b4690c3c4188d9d26 SHA-256: d9b95a406d536cdeab2fe769a2e5bd50cbf4f869f6cf55cae1fddc63b79333a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains multiple links to external websites, some of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to trick users into clicking the embedded links. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://thaisomboonautopart.com/userfiles/files/85288683979.pdf In PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/34270361706.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/96635354482.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/79495660557.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/razosud.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210911_73EAD1BED05FABCA.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/69053920592.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/sosoboponivemuliwarosuvit.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/38761380333.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/71239937093.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/vemasa.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5f0be030b011827a14c1cba9319ff0d8/6728494609.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/40150784035.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/006d73fb7d95823434a13ce0d2aa9bbc/walupoboneseluzanag.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/tupojixuzefo.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/30396457492.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e33d028f6a---rudajewefowox.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/1458986332.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/gazuge.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/7047016804.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/fokepinuzaxebutibisemejen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=valid+gift+card+generatorPDF 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_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 20072 bytes
SHA-256: a8af4b7b6992217c4123a2262cefb4435ec1a66049737404eb7d1c0209b95f28
font_01_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14472 10452 bytes
SHA-256: 267394be3629a1755008b38d4e02a787d2ec301919fe4bdc728ffde2b78707ec

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