Malicious PDF — malware analysis report

Static analysis result for SHA-256 a433638508848fce…

MALICIOUS

PDF

106.6 KB Created: 2021-08-06 06:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 57027e64d8f42321572e357821a412a3 SHA-1: 2893be3370d4eceab2ce1af688092c4d26d2f160 SHA-256: a433638508848fcea2687efec1915b5265b8cfa695b3b85c9fef8927dcc2cfe6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3598f411776bb09d4e03d53f7fb84c77/25182259218.pdf In PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tapejawepudewulaku.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/wimof.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/visosokovoxeliwilomeket.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210505010617.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210510045134441275uxgiwf.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/53500821825.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/34965730120.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/watulopus.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/bosijosufepevisen.pdfIn PDF document text
    • http://donghotam.com/luutru/files/72784864513.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f698580d---lixalavefapob.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jsr0evmj8bb5um7qsv64u34uea/kasewipu.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/zotezug.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2171ceba10---12640261179.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3jfttsep88fibnmncgarpj8ou2/lozufirikotegupixeb.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160732bc8293d0---kezokopepefo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/545c6cd1709942fc2560a4e348c73501/vavimopofix.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/50448824298.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/2825be1ef7bf2a17acc4106575e6f032/32438640327.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jivozabitu.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/butarokegosomidijima.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zunasuximi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8309822a1b---dujogodutudawudul.pdfIn PDF document text
    • http://regmac.net/userfiles/files/wulaxolujiketilom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2+states+english+subtitles+srt+filePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 10636 bytes
SHA-256: 970db7f958db0178b2ec640e20cbb07c2adb98d7baaef9779f65f52389e47b61
font_01_sfnt_off000149a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A7 1908 bytes
SHA-256: eadb1838d7c24aa2b3d99fa78926c802ca5499a44cfb8f8315f91102f1318f2d
font_02_sfnt_off0001525f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A71 18928 bytes
SHA-256: 2dc00393cc97c457ebc1d628e05baafbf845c4140a2866e2e906d43bab5daf0f

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