Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8afd3a8403387f5…

MALICIOUS

PDF

89.7 KB Created: 2021-07-29 23:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9335c951fdbe493109baa7908735a902 SHA-1: 171cded0ad2af24b26829cbe00128cf69e51e8e6 SHA-256: b8afd3a8403387f5e51d4294992d64ad410f825655610887b4ec6fb2daec3735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple external websites, some hosted on compromised CMS platforms. While no scripts were directly extracted, the nature of link farms in PDFs often leads to phishing or malware downloads, aligning with T1566.001. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://kryotherapie.net/neu/userfiles/file/54149454887.pdf In PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3cfbbec79---95426072284.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4980hkgvv96r4v4l1c8jspi1i3/baninugajirojidowabafiv.pdfIn PDF document text
    • https://2acontractor.it/images/file/97905494021.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9evmvm452mso2r4ckqf1150ioi/59137351693.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8571d8a478---kurojamebaxifu.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/nekaxedinekomulokona.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3aca5eee---32785702878.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609025710e0ea---wewalizawapo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/463a1f8aed06bfd3ac890c4010e37211/80063298813.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/73232051323.pdfIn PDF document text
    • https://airbays.com/userfiles/file/bubagapaxolesudapuni.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756ce333388---lesagone.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607128b6a4241---23247032246.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f00a37fc39089dadd3e39e7ed2bd716b/71467535085.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/vekepekonale.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/sutak.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/rijawuwujoli.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qnc3d0spmcpfnd01k1ffavc5qp/rabugumuzewigasude.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/kegapuxibomidofizofajema.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/be065eaf03d92b538823a487bd186e01/jikamivupefoxozazoxove.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e64e96f100f---rudawax.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qs9cr0eaavphaokrkt6ljepic3/58528678023.pdfIn PDF document text
    • http://airsoft1.ro/files/file/71407097212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lovely+good+morning+images+with+quotes+in+hindiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 17752 bytes
SHA-256: d5e9bfd069d07eda77bbad5c4c5cc73d5ea8423184c95d1cdbdbfcf62eb1f759
font_02_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D79 11164 bytes
SHA-256: 68724df5f5f073dc200ec74381cca38481c46657f2be72c0adbd18459ddaf2d4

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