Malicious PDF — malware analysis report

Static analysis result for SHA-256 977be1a5ac9aedc5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 01:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82044f8596282c1049f98cc25ffe9467 SHA-1: 2454d63d12a2c4b65b0b8bc15a53190012d6c95a SHA-256: 977be1a5ac9aedc5aff02554b2b89bfd5ba37cb12913fb75a6a9efec706205aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript likely facilitates the redirection or further payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qalmbvtks2k5m4ere8q5jrba6s/16138921488.pdf In PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/10984853775.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/gedovazizepirilu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/506818c831cb0539718c2d0b53f58a73/56922396654.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/46b29c2d70def479bbd02951841f4932/vuwoloma.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/62665884533.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/pujoxib.pdfIn PDF document text
    • http://jkohut.pl/file/zejodisarudopubogeno.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/pibigidiguburis.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/30948551499.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7bf7be897---60121926279.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/87957299869.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/bubopuxom.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gejerad.pdfIn PDF document text
    • http://simonide.org/userfiles/file/55940849008.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/52287894646.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///28499431550.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/zevufarugivomuzigobuw.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/57636133a095a75a00867c6e2fb3f388/12965486869.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/vutukekukirojujuluko.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/80486338819.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/eafe9027ab02d07ce84a4fc740bfc2f2/wunekabazuwumuxokomokew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+coPDF 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_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 18652 bytes
SHA-256: 6c8f2bbecf64e108f29397cd48a2abf44b5938b7afd01599a0db8741d55805f7
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 9940 bytes
SHA-256: c4fb4036f1c1d1f4515b9580ca507295afae848c8dd61f4c88a9fc43fb238262

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