Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06c86b626213df3…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 08:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6c4da01b04b393f051cd6d8cf2ee425 SHA-1: 984b32f620d5d0e890d5fee91c76fed96037f947 SHA-256: c06c86b626213df37b97ae252f9a8ff3c6904c91c542f700687f5ddf03e88b97
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://goldway.jp/upload/board/file/besipis.pdf In PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/bitezigudafidaruxuxeroro.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h1r9g5138h746p1r01q937jrs5/pebotesaniri.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/romaxunizefutez.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/fuzoduguluwawub.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210928_181434_6700.pdfIn PDF document text
    • http://kodemari.info/data/files/xiwafebivodoribokegovuz.pdfIn PDF document text
    • https://khanikango.in/file/72483028492.pdfIn PDF document text
    • http://archive-2013.humandoc.pl/attachments/file/lolaxaguwo.pdfIn PDF document text
    • http://sinostandards.net/upload/files/99695890717.pdfIn PDF document text
    • http://knipia.com/userfiles/file/lamixibamoxosuw.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/nevajesesanakumajax.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/puziwinumelidi.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/22428010641.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614928d7d649e---nomabapowojiba.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/tezovutinovop.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/xabirigikodo.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/mevukurilu.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/693d6255e09836e8b667279830ba7ab2/6528454328.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/55101414241.pdfIn PDF document text
    • http://brukbet.com/user_images/file/6984861382.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/29683507174.pdfIn PDF document text
    • http://nemochem.cn/upload/files/64414931511.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/16007180240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=stalk+instagram+without+accountPDF 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_off0000ae13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62A 10900 bytes
SHA-256: 00593abac3ea561d596cb6abc46fc858a240791663b8aed0ec2e8ac8c4f66b7a
font_02_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 15280 bytes
SHA-256: 753c082c832030597a8a442c67d9c29f4944259f8a0528fbeb80f6af09600eec