Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd52c5b544f4ba8e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 15:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cc0ce2ab532ab0803642ec8dbac978c SHA-1: 672939d037602b4d782492fd8cb8ae49d79575b1 SHA-256: dd52c5b544f4ba8e3ba6a2f9267d9fd0cdbf48f5ad1f17eed63089f156bdf35b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF appears to function as a link farm, directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=days+of+our+lives+episodes+free PDF link annotation
    • http://anipetkingdom.com/webroot/img/files/dujafipimijufil.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/64795856693.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161528d9792804---tisatukozo.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/kogapazoxomurumufuze.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/49375498540.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/pegizive.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/nosiwusodu.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/29259049633.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gitugobuvoxa.pdfIn PDF document text
    • https://coevent.ru/upload/files/70313628286.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/diwipi.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/822545711.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/zajix.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/895546e672994ab1ea57811c7dced8d7/14229704073.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-20/20210920111256317519.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/devonanafedasarowo.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/75697471895.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b11c36340f0049be16851964a5c7752b/livet.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/66140641086.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161511f802cb19---7107261669.pdfIn PDF document text
    • http://riph.pl/userfiles/file/joxokelavizido.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/basapimadoponafukom.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tegenovumisejeremiwevusi.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/77302928769.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_off0000b3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 10572 bytes
SHA-256: 6c63424b4d92667293879b3fe50717899f64e218e2df93c249e1f151c25cfe91
font_01_sfnt_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 17124 bytes
SHA-256: 618c3793f732a761634e1f6ddc9ccea1542d7c5e1995821b0942a06351b944c4
font_02_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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