Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11351dd8c3a42c2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 08:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4b7132856d3fd0d4dfec2242e82a378e SHA-1: 4d7aa9d48b88333da96e142fc82471bae4e7a839 SHA-256: d11351dd8c3a42c2b9ea1df21bb4985213c4f4b0f0ec536da9a1ade8ffb6c965
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://oniceh.ru/uplcv?utm_term=aiptek+pocket+dv+manual PDF link annotation
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ffed28a81502f78d78edad2a81675794/mamomukufupiwufes.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/66097680132.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/b9tgnik1ptd8rdgg079qsmcbf1/tuwumukokixo.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/vijinubejo.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/44791956860.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/41179485355.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/43738750452.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf722fbbc---84463092853.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/birikamesekigilodebimate.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340071c54bc---fapodevabujebu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767408954cd---vofiza.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/91652817732.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161003dc00cf61---takitukefuxazej.pdfIn PDF document text
    • http://chinahongji.com/d/files/mevazudunarafukulup.pdfIn PDF document text
    • http://uchid.com/uploads/file/97101611348.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gajudomujenenejexe.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090212055773499.pdfIn PDF document text
    • http://m2m2design.com/userfiles/gafumebuladonudix.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/685d82e9934446158527f580559fea71/78963383278.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v6c7o1hneesr8sg0mqfi2tvl8g/makafuxidupifasefu.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/65986193849.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/5040220335.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608309f1c5cef---55319431503.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39D 20120 bytes
SHA-256: 5ffbb353fc73f950622c02affc62733b82913cf32b01eaf11a8ae3cf5e642d19
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 10644 bytes
SHA-256: 00ec97eb51dad8101c72d67e67878bdb87ec317534e2274f9eeec26989a7743f

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