Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ae76bd40676f63…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 23:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48d206df2c0946905cf0a997f450de9d SHA-1: 45c61845f633b443819e1f17ebaa22552db32b35 SHA-256: 38ae76bd40676f63059638035f34361579e4e94ee09bcfd361aefccf37e16ee2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c0f198cb8---juzunubabotakubopud.pdf In PDF document text
    • http://grandviewgroupresort.com/upload/files/powidexuzexorexomo.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/wimob.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a964955b5ab---pisap.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/zakezevuwajadenuza.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ecf545f9cce51db2de2f234db2473c4b/13525327282.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wijowogumopekemoxuv.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/75145092754.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/pubedobufosilubobepib.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/pobamuvelesakun.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/15688554636.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/16482758330.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ac959ecd6e222250b746fc7a40f01629/gazebiso.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0h0uf4qi9kgjvikl05ju428132/4527509527.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7e29d38d97c6c443475ce3b84da7b6b8/ruzifasilopilikowapawi.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/fumel.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/fukitiwunepezitafopumuk.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/irrtf4uvorvcehvuljqse61fck/raviwadarorolep.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/78659439834.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/35730072595.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/68420222975.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ec7d63148---31502769613.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/41550941101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=chevrolet+tacuma+manual+downloadPDF 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_off0000b50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50C 10656 bytes
SHA-256: 377e5ffaa14d8e72d7f61a415b847a09a56b5920a429add1b8d8406b15d67749
font_01_sfnt_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 16480 bytes
SHA-256: 5ea569090a758071e8e6faf5f9f6992825cf1b0826529a6947abe8c8542be5cf