Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abee4acf73c7729…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 00:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f51cff780eaef4a1c53fb257cfa99960 SHA-1: edeb17264842e006ea11a019702fa5812d7952a6 SHA-256: 6abee4acf73c7729522f39abe59d2efc02d6015def83763bb9a81c2b98714f12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/rk8dvfc34maor8seu9k9hjleea/65141277025.pdf
    • https://organicearthfiji.com/documents/file/wewelufulibaxumovurokod.pdf
    • http://thienminhgroup.com/uploads/userfiles/file/jesomofeboz.pdf
    • http://campingwithconvenience.com/files/files/58300222503.pdf
    • http://travelcenterpuntos.com/campannas/file/defixiwufetalorulujak.pdf
    • http://silverk.ru/img/lib/file/xojel.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c72ee5fb4---sipapupukom.pdf
    • https://hsse.cl/files/nuxisupokimepiwivij.pdf
    • http://goldia.cz/data/file/69963345204.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613194a45a068---nevukimupimanokekif.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425f13420b7---genuxo.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/xuwozuwem.pdf
    • http://laros.cz/UserFiles/file/mekosar.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f808c767c1---36821566252.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/dulonitaxawijofozitivi.pdf
    • https://mediaget.ru/userfiles/files/zameb.pdf
    • http://spartapr.com/images/upload/file/sasikeraligudo.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613da623d5387---58068319165.pdf
    • http://ghibms.com/userfiles/files/mukixelitovuwisuwajolodi.pdf
    • https://ladangmimpi.com/contents/files/37944570435.pdf
    • http://zamgph.com/uploads/file/031411075231.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/liketasefikinijozo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=piratebay+working+proxy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec1.bin
f1e3194989bf725c70224acb3f0e960417b9ca7b2e26d91e2c65369b5560cfa9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 17516 bytes
font_01_sfnt_off00011c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 16792 bytes
font_02_sfnt_off00013435.bin
c2c4b0a8d2a8bfc9445dca9ae9e48408f72db65a2ab0ee9314405b4f71ae4f15
pdf-font-stream PDF embedded font (sfnt) at offset 0x13435 10748 bytes