Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc878915092be163…

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 00:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b981aec4c6467989ef42339472d811c SHA-1: cc3e48e525cbe6e38b59d105ce32d70b1228a900 SHA-256: bc878915092be1631e49b31417cc0b1fec2831c2c283af29dba832833ddfb00a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://all-vehicle.net/js/upload/files/tokepatipefudonebepiri.pdf In PDF document text
    • http://lasfyy.com/uploadfile/file/20210905075338659.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/21446451533.pdfIn PDF document text
    • http://snft.ro/media/file/tuluzabepaxawiduruwofop.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/jojavivalifegemop.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373e07128c9---legiwa.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/90puhj5lp3fj5ugkklimjfkoh4/xisifikovomimijufo.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/saxanuwujorawikuvele.pdfIn PDF document text
    • https://alpinashop.bg/files/xivaziximepixug.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/wusevejaxeju.pdfIn PDF document text
    • http://opsir.eu/files/file/14254676163.pdfIn PDF document text
    • http://rayanchem.com/d/files/lenusibabesewofesuverej.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed357ac3ef---duwidunujexunategale.pdfIn PDF document text
    • http://agro-partner.com/Image/files/rugizebenoveju.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/83211376793.pdfIn PDF document text
    • https://cargotavio.ru/files/file/87381727141.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/vujewa.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/cc88dda47216254927017167f338d90e/wubovosoro.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/89871749220.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/36701561578.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090722060673499.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445049e633c---26489850285.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/bopidojekomarejajowa.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/xekisikoserefaforomupi.pdfIn PDF document text
    • https://sanidom.pl/img/file/sujesexijomuwavabaxopovu.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/54253202815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=streaming+lucifer+season+3PDF 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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 11028 bytes
SHA-256: 19f4886da20d5d289d07d336e618c4b186c56963b50cfb60514a9f3dcfc6f85c
font_02_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 19624 bytes
SHA-256: 2fabe5454471bd1d7ab4f7680a55da526e979365b1e81ccb5d4014d4b8f1890a