Malicious PDF — malware analysis report

Static analysis result for SHA-256 073ebae5bf516fa9…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 15:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1bf7bbc0c4952ae8140e15cfd3cbfb8c SHA-1: 6e3fc38c1c26a1c66752bb33cff7142c42f9bfbf SHA-256: 073ebae5bf516fa992fe7a899ea842e327b0ec1e1ac68f31d152b96105872626
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains or compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://daiichigroup.net/uploads/news_file/nuzuxogovejeguwovu.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d20aeaef1bb---7615949921.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d015dca173b78e93817f654d200cc304/mibotoxavu.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/gulujalisososiwumen.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vefetibole.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/26547cc3cacb9b605ca2dc1bc83af54c/94107657539.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fozapiroto.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fc1f161581d4973466a6c9328c02ed16/ganomisogexugu.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/51881891979.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab38ea263f---92774653596.pdfIn PDF document text
    • http://hueide.com/upload/files/retajudos.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/20453939570.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/77159822745.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9acfb773daad477a0a3cc3bdeebf7b61/61023595211.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/wufuzuzugimuvafu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109043f7ccc0---74984220446.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/377c1c82223084bcdc97e7542029d748/sanebojel.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jedivev.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a343f10943297f76afe6a8ddecda6986/14288327717.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1efb089cf2333c11189539ec7937ed54/bazazoginapuvifevineg.pdfIn PDF document text
    • http://linker-apps.com/files/sanotoxenefelekux.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/60553048467.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/759952fa1f51dd5d873cd03672ca6ab1/kakarikunowenotigerixufal.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/lufogevibagerexuvexud.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a457dffb98cfce5e8dd63e3573c83eda/xugiwotarososisog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cpr+test+questions+and+answers+2019PDF 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_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 11164 bytes
SHA-256: e435259027bbdc792161adc5eb61df74ecb2a5c4d5c077bf4ceefc1f9b38f532
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 18172 bytes
SHA-256: 57bba6a1eb94bcf2675165ccf44cdf55efd7a574ef7c338bc7ed8b65a8bdcff8

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