Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30f3face1d76dbb…

MALICIOUS

PDF

75.6 KB Created: 2021-09-26 12:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06273a8bd7f0e866ebb435ac069625e9 SHA-1: 9cb2c7ca736fc507631f3389c171c3c9b8d68aba SHA-256: a30f3face1d76dbb08ccf5229461198c20e6d5d4903cff2c893f83bd9c4af9cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and varied, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms strongly indicates a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=extended+periodic+table+pdf PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454728a4359---43031767156.pdfIn PDF document text
    • https://cncunse.com/d/files/rakikurekogizapefa.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/xaxosab.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8db3a9c11692266c631a288da240f6a8/jozupanaturu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488ea1851ec---wujujo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c99e3c11---mobetobuvevu.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/nodapu.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/rigigajisomumam.pdfIn PDF document text
    • http://uhorder.com/upload/files/tosexufidewavuxileloz.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/kakesirinonemakudakep.pdfIn PDF document text
    • http://www.heksan.com.pl/file/vuregivibirawajoxu.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/tuvetededazaxigakedal.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/kigidi.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/101898006.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210917003652.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5e093ed6357b2b6348d972331bbb3959/kuzeraka.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84353093950.pdfIn PDF document text
    • http://sro52.ru/uploads/files/relanosigoteregenuludaw.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/55104660760.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/bukodutomuwiwom.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/tulaxakeluwazasetapupa.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kafetikasujofemebuvotasak.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50186216433.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210905040711_mb4nam.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DF 16360 bytes
SHA-256: 31a01bad35d629cbaca59dc24155b8c2a7939b1eb4854d0199354fb1517222f7
font_01_sfnt_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10668 bytes
SHA-256: 90e51bcda49dcccbcc0b4218d396a02b4361390b243e4cf72388df2b70e0bc9a

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