Malicious PDF — malware analysis report

Static analysis result for SHA-256 115014d16ea1c1ed…

MALICIOUS

PDF

107.1 KB Created: 2021-08-26 14:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bafcd1445e3256090b0a071be2a226ca SHA-1: 7e2e2dc6757b9cb4bb02337636d3f9a04bd5ff95 SHA-256: 115014d16ea1c1edc04c3aeb979c9a970dc99309e16761d8893f7962420f44e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm hosted on potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007. The primary attack pattern is likely spearphishing via attachment, leading users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=rules+and+consequences+worksheet PDF link annotation
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce94010a749---5334013312.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/pamumikoxidenifuzapu.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/34113047698.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210626_52B4FCF21E2B8CD4.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/69576277733.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0c4270c960306ab4c00dc7f83c3f8ee4/sasedeweseturobanigenotuv.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e662a0b9d26---72488078846.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/pokijutupej.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a23ed9615d807ec941576e14f9789480/40507084687.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609630225c204---nimafiwaxibivenipikurim.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf265318b2---sobaf.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3f61c0d41fbb2e6338cc47469c255e9c/47360581598.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/e6dom0v1t6pu2ik77puotm8oco/47007270818.pdfIn PDF document text
    • http://airfa.it/userfiles/file/42122701497.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d1d64f5a---52864558849.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/resibulawer.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/kikomud.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/homqjg08k341jfs3oihrn4let5/puzugepogososuker.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/bolexosajesegape.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608345ff3a7e5---jewaludulajitotosafon.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd84967f7a---82914701779.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zisasaxewijupo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/21818625637.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/sufajunelidago.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/81866166264.pdfIn PDF document text
    • 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_off00014195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14195 16536 bytes
SHA-256: 627403cce930e5a4a480e701580b352d6a025bca3708d69f42db08200e70d9b8
font_01_sfnt_off00016c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6B 10844 bytes
SHA-256: a16f33b11d4fa982456e1268789ca51fd5ab83b52ddcb0b879548585b8d66f8d
font_02_sfnt_off0001854e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1854E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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