Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ffb8c708ce81e9…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 12:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9220ea74d2cbb4d0a17b39695010ac3d SHA-1: 0533fc9dadf883cc848739c34aa4d96140952c39 SHA-256: e6ffb8c708ce81e9f09fc8a01ac9155a1f2d36ce4511d212d3fe223e560cf048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 https://diaochue.vn/userfiles/file/givinuwetugefaboj.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34144fa6c---mutedinasadomur.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76f794cae---38344425084.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/maliromabolidowi.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/fubibewafujomozogonuto.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a9f59bc0---36987254781.pdfIn PDF document text
    • https://afayl.com/userfiles/file/44334625287.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xaxogejupelebivegebesoro.pdfIn PDF document text
    • http://novichiha.ru/pic/file/42692328985.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/546e4f9325666cab99794d5013587c18/80283404689.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/18441046721.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/42251016563.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070532375a17---28172935171.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/texuxiligutudipafexajo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f4bec818---4282354224.pdfIn PDF document text
    • http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/64264429543.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/27406152055.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/31704979658.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf5bcf2cd---nasimepubojegumegexejuvu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/606d8338f618793273f76eb71cf5ca51/28367237216.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf40dbc3f---gurulunefaferebedomam.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/74299673506.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/5011739152.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f3ce38b20a26917c62109287375a398a/96872045739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mortgage+loan+amortization+schedulePDF 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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 10968 bytes
SHA-256: f6c22c69e8bb62a672bb6aac04cf08351d3063b57c224851ab5d98de1572f599
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 18540 bytes
SHA-256: 9fc01e45fb81f7d7d45a1a6240bd789add565b13f6f7742c3d660d821f00c190
font_02_sfnt_off00012ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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