Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f785ad9f7acd2f8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 01:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6b7e16a0277a6ea9989032b6a2c4cae SHA-1: 8e954f67e6e169c6adf2ebbd9f8626afa9fa306a SHA-256: 4f785ad9f7acd2f82b10639643d3fa1b2f0683b7e306802732f9cd6ea78384bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm that directs users to multiple domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160750680dd148---8525788009.pdf In PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f03ec10f439---gozilovazo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a69daf191b8cbe69eab715a71d3f3927/83316634660.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/nametulajerufetunibis.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/furasezinilebexipoxofaxa.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210810_96278F1668F022B8.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210604_180351.pdfIn PDF document text
    • http://aa-nusd.jp/75782537782.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/516f95372a733c6dbfd3f893fefedfe1/95883821932.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/nezirenijamowuzulikaderit.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016792d9b1---56741924650.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ds25ag6361tjponve5l35c4703/81182671014.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/gezikalopenifaxekodewu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/790cc6fa01e8012c68c9d9376b374d5b/gizuwogodaj.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/85356488015.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jdlnq3oq0jqjkh85rt9pfc2o0s/fekanula.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/paruf.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/cracuerquqhslsthdupn0ii558/fuloparujavu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e167346785ef4097ed93638ccee2530e/nuxawij.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/xowujubozezogovulasi.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/zitisepozewu.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/wazewoguxurawakifepusamef.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/597a362d2c481c6515018efa916ad0ed/38262072012.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/dolajarapelanogumet.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd650e41469---94919890441.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/83897452164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=outlearning+the+wolves+pdfPDF 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_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 20752 bytes
SHA-256: eeb4ae3b9d0a3c56ab2c4fe83ffc5f7b9a52ab84636438dd1db1c8c87a9a585f
font_02_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 11056 bytes
SHA-256: e8e2a5f3a70b97d8fc740f47f206747d7562ed311714fbab84794d3dd8900b21

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