Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44dde0ff6894add…

MALICIOUS

PDF

88.3 KB Created: 2021-06-24 07:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0045e23862a8140e61580f4d4a94e960 SHA-1: 14b37e16f9cc3139d6e938a0524fb4fc0bb69713 SHA-256: e44dde0ff6894add89bc892332c29d61be079c5985f0820b3dedc8f5588f3b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dichvu12h.net/userfiles/file/90068576598.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e3d89c774ab59c77d01a81326231c8f9/togusegixisesekiwur.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b24684670---dutunurubutuzazotu.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5bae7067---75693499132.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f5b8823ba---45351962864.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae454bad5---musanemekalebod.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090106a21f73---bodikajejigesilini.pdf
    • http://brandnewgoods.net/userfiles/file/vozifemetosavovel.pdf
    • http://meble-tk.pl/userfiles/file/xamadufelakowa.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b415fccd78e1c95791f5b7d62ff7dde/kajolevena.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/43887b8e860eefe28a64eec745f153b2/jawiraxol.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/30504f058b7e36d939b59ee8be7cb4f5/divizilow.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607564b51317e---livipezubil.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dfd6b5efb---53024281592.pdf
    • http://jjmcp.jp/userfiles/Image/file/xigaw.pdf
    • https://atlastoursntravels.com/userfiles/file/vavamoromabuwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=una+limosna+por+el+amor+de+dios+tab
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40f.bin
3f45c24a006548ab682d4a9d616dba890267cb686780d324dd15fb9f847330ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 5236 bytes
font_01_sfnt_off000105c0.bin
d0835dc58395fd889f9fa6e78c65f201ea561d8fcc18fe1d3495405fdff95c20
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 19944 bytes
font_02_sfnt_off00013f4b.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 16060 bytes