Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99b949c56cd6c43…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 00:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf6e77574021be68a4530864e94f16c7 SHA-1: aa596f4cd61fdd861eca7398373bd9447d09cf7b SHA-256: b99b949c56cd6c4354e8c0a81250e5dcc219346ffef159211fec23953f062659
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which point to link farms on potentially compromised or disposable hosting. The embedded JavaScript likely facilitates the redirection or further payload delivery, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=how+to+setup+socks5+proxy+on+android PDF link annotation
    • https://servauto.fr/img/user/file/dalafoborawupuliwevujo.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/mudezonakijetu.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/kivomatanarulava.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/49734409082.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8c2539711---10921012453.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614253530e9be---fupowejebuw.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/wokotit.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/58948438638.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/97322567578.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/7224268505.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/zuxenobutesam.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///dukeda.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7318a313---57126246553.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/42366775228.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/45290256333.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210912_014914.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/noregipuvidufizanok.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raxudidolatirof.pdfIn PDF document text
    • https://pellevah.com/upload/files/gezuzivutubulexuzaniru.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/fukiwizila.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/11332541910.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/xatofarujekomoput.pdfIn PDF document text
    • http://edituj.cz/res/file/fikaxisudelifoviboz.pdfIn PDF document text
    • http://abwva.com/uploads/files/xitifojokovukalegigelefe.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_off0000ae9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9E 11080 bytes
SHA-256: a6284088c4b673ba69d11ce7e510183cae5ef5cef1835d2b5969fe311bf2d031
font_01_sfnt_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 14644 bytes
SHA-256: 69a3fec160d2fa8ec376c375c17b0c2473e0dd2ca20f717c1786bf86b33ba1fa
font_02_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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