Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8114418a294a11…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 12:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bd501e2897f09d5a9103cca077fb06bd SHA-1: 7cc36c81a674a280789e699289c99e4b049a4f09 SHA-256: 8a8114418a294a11a4e06e36e31e99e2dbb2d52f3f351eb08379448e3e7759af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. The primary function seems to be redirecting users through these links, potentially leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=apc+smart+ups+v%2Fs+650+manual PDF link annotation
    • http://nenorm.com/files/files/fidevexo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e81c644f---83171320678.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa439031d76---golanemovok.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210821_3D8F0E45D240B1C5.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xasijutawa.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53343865483.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/goraxojuniligig.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/86151020203.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bawetituturilufugo.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/24116009387.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/wevenivizowavota.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/tukasejazobosoga.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/75530578622.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02cf9e25d---wobesulazikerituliwad.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/nuxolire.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/jivofovolanubimevuvup.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/04c9b02cfe2ae20e76ea9592e4ba3832/19660756174.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2c215ce0---lutej.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/38426264599.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/28608892577.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/tazimirur.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/mibem.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xuwomosu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c5c80f24---fajetopakovaf.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607208657d92d---27000922370.pdfIn PDF document text
    • 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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 15436 bytes
SHA-256: 388b08718ea8efb7e1d42c1d3caa3b1974998d766572d9b9e24e36d449e294fa
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 18308 bytes
SHA-256: e917d6092ec300350d41406c39e271f5676d1a425a447981dd3cb5728a01d58f

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