Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc469200f4d860c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 02:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4739398cd3b0b816749cdbced13b5dd2 SHA-1: c54c06d0122ec80cdba602faac8f7c7e44de3e62 SHA-256: 7dc469200f4d860cf66026b54332a465dcc7a5bef87f499e3ccdf87c382fc7c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many hosted on compromised or disposable domains, indicating a likely phishing or spam lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://otoform.com/upload/ckfinder/files/lofozitutopax.pdf In PDF document text
    • https://living-stone.lu/userfiles/files/vadabasenukunupilodenu.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/zikal.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/sajunelikak.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/gqj1nd4kihp62hnnu4imqk8iis/wunozudep.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/69847919937.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/totibe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f9e964b73---zelumeberugowa.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/tavikutilajepimejikor.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/70737234322.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/71858285858.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1b9301bf---xepetokilivavukaledodi.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/59239341662.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c30b23b47---bumukenirepiv.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/51045473297.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e8c7b2c48005b6db75cce7bf56a3dad/nugofez.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/f2i31flgqj6vm1cr5uo2aimid3/25553372180.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15c31053b0---3685660427.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077433a8a7f2---vibidekamijute.pdfIn PDF document text
    • https://effetre.biz/file/90614228617.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6c4dd7f19fe24c577679d49adf962212/nepuremaxeresarawagek.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18f8d4124---renaliga.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/jobizadedu.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/5104635580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=off+on+the+right+footPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 10144 bytes
SHA-256: 612aea7368e7dd41bc706ff1d100daa54827c96d79c03982ca26e3cb94a1dfa4
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 17488 bytes
SHA-256: afe828aff1aa812cbedb0acc9f1d46a62415111d99153823b842a960ccc34560

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