Malicious PDF — malware analysis report

Static analysis result for SHA-256 40108dfadc4fec89…

MALICIOUS

PDF

70.3 KB Created: 2021-09-04 00:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0788ce280d3ed9658df85d48cdf849e SHA-1: 248e357d53e1591498d6cf0f65fabbe984b19e9f SHA-256: 40108dfadc4fec890e191023803aea6e004c776407e715d681fa571c4ed2bab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via link redirection.

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://jasz-pap.hu/UserFiles/file/revedinorime.pdf In PDF document text
    • http://csc020.com/userfiles/file/20210606235647_c9744k.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/de3d96aaa2e5662f92216135e4ebecdd/75346267463.pdfIn PDF document text
    • http://zae.me/datafiles/file/22111403231.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/1c0e96aef3b320f33f3acd8a68fd8e6f/nolatix.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/932dc18bc08e14aea5a8afe5c180ca71/4266053170.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4609b37415---nabekeku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b07078e1---zekikoru.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/37320640127.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bd4e73871---sakigalaxazugedusomoruruj.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/boxifovavevoxi.pdfIn PDF document text
    • http://whatdwellswithin.com/file/nalevuxelezunusel.pdfIn PDF document text
    • http://getvisa.ru/images/File/xikak.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5d82dfb0---nedexerozibigilajo.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/ranogoxikenemofidite.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3d3c999e5cdb28f215a9ed0d14685d0f/98167564533.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a9a7196c420d98587b4b4e28314ad862/riwemev.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b792ad89339---livakaxulewuwumakepij.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/nikejepozakomug.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/natusotozise.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/44517209504.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd4751aeaa---12816069885.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/sazemu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b152507e10---wibuzimome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pfu+polymerase+pdfPDF 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_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 10580 bytes
SHA-256: 87cb34d1aa31d781eb104a34e136c89596e0f4e127374ec136891691ac221ea9
font_02_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 15440 bytes
SHA-256: c4e7ed3fdaffaa5ff8e61ffa0d74f40e67cd862ad6a53a7fb8f62e314c4e02a7

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