Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ceffcbff874795…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 08:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cebbc4f832fac145eae9be261638b40 SHA-1: c35e1164a40ec7ac7f91a3f086180447b94e10ed SHA-256: f3ceffcbff8747958e59cf8d9ab38d496fb77efb25e39e1149569aee13700d40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or conduct phishing. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=style+works+xt+universal+4.97 PDF link annotation
    • http://mudrberanova.cz/userfiles/file/82648634618.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/62597259265.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/balodepedutuzitomigolo.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/rakemaperewisobonifu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/sezajolakawawigosidu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/jasenisajoni.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/50133512604.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/50a0901df95c1ee29ac0e70d3fea8e2d/24673410448.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/98872295129.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ec006bbbc---10451530364.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160723a07efdb2---pifugujumixumolo.pdfIn PDF document text
    • http://belst.by/upload/file/sevevosemevipijowanaxedut.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/92736054802.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d08ecba697d---gepuviruzakaroxokelilalad.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/38338347451.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h2mc16m4nogs5i0bss6qcled63/kovovupunutofumetozasew.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c28cca20b7b---tamelomitapezuvoperol.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/34625790816.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5cb2e0976---rasokejupidiwikas.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/60269894239.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe81bb6db2a---6532343447.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/bojutunawifanel.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_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 11100 bytes
SHA-256: 05f6173ab4aa9bea227dec29ca6f406090bcbd00d4f3ba67769b4fdafaeb8330
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 17072 bytes
SHA-256: 58ef85089358a9ca31c0fcd166833518353447d61a2a5a94ed1d42a78ebef636
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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