Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bbb42433c22337…

MALICIOUS

PDF

100.3 KB Created: 2021-07-14 05:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba3b22afe7d7f3f86868553b5dd36919 SHA-1: 1c179fff7b86b09346374f3e69511b4408b47b38 SHA-256: a7bbb42433c2233756988fa070357c16c670bd474ed7b6ce55d85ce98527fb61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick the user into clicking these links, likely for a payment scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://crysiq.ru/uplcv?utm_term=tax+principles+and+remedies+dimaampao+pdf PDF link annotation
    • https://computerzone.pk/file/99274505296.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/fabaroxisuzikepovab.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/pomalagulovagegerew.pdfIn PDF document text
    • https://artbynela.com/uploads/file/36601641093.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/10098025945.pdfIn PDF document text
    • https://beltamas.by/content/Files/93398028260.pdfIn PDF document text
    • http://biosite.ru/images/news/file/jaliwo.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj3sgegnfldahh6pmdoa2r7m40/49412720224.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/24881830194.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/dapelokivojilorobomiroju.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfade42383b---kokusutumeda.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/80546416129.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/88548252216.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/56779616712.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/ruxisudo.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/61793775394.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfb1f9f597---kukeratujefurodel.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/47505729943.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b7002930---boverekivexiserironawud.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/13553871342.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/93094491226.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/pogodamigupipejoge.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76d1fbcfda---65590689390.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e89e7a55a5---vakuranatugebekovogupiwa.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061903462837.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f293666426---sozijagax.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_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 17624 bytes
SHA-256: df8b42024a1aa65216a58ee4ee66b77af51ed4f7617fa9e0281712dc58c73a93
font_01_sfnt_off0001526d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A84 10748 bytes
SHA-256: 126d2acd744470acf127a1a61dc9de09a993e7e1bfaeeb881eaf8f2c14791c5d

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