Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce78b81e65bf0a2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 18:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 74c382eb0cbc6ea54e65c9183ef025f6 SHA-1: 373c2f618e471418fa616b0134fc9c879d8bb1f9 SHA-256: 0ce78b81e65bf0a2ae84ac9b5834633c22019847951d8d8895ad973734656608
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stancijanegrin.com/UserFiles/files/17325357914.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca048f39f---28387203700.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/cl00igugriik5p1n61186flofv/57033044473.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/719c846867435caed30e3d52c72c5f5a/visod.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/69747750646.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090afd60aa33---75046895089.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/28020786297.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/dadusikemamafiwamataxot.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/94894822557.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210622_225309.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/gilibevovaxozorutu.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/qo5ftfki0vjk9mdj834157s6mc/67476089506.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/46374920290.pdfIn PDF document text
    • http://klefmarken.se/upload/file/peminumimeratabuwur.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/96535707387.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa9e38601c5d6f954c9b8ce5d2a148d3/25457265206.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/9049697339.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/10650124878.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/jiborafinadimajiwimom.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/xuzarafarumufekerusifobip.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/37328511739.pdfIn PDF document text
    • https://loctra.net/userfiles/file/53809836860.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/jiwawusomekeba.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/eeg8s6ehadbj0o2rqcegh6eqt2/57260172197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=magic+e+worksheets+3rd+gradePDF 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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10840 bytes
SHA-256: fea6301dfdecce6898b4e8394cf7e3c8de43d8bd4d4d58f9f3b0f43afb3234f8
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 18968 bytes
SHA-256: 23768ba2d3c5cf63f8c85b2c42c528509225b41271cfce718a239e6196f809b2
font_02_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1