Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4d56406b57a7ae…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 02:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d568ccaeb1a36f07c8cb19a74cf0335 SHA-1: 6e76d0f8caddbcc321aebc9d69b660d727163379 SHA-256: 7f4d56406b57a7aeab04baee10025858fd7d104c196c1fc6cb71f62bcf26ae7a
196 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious files. The document body, though heavily obfuscated, implies a lure for remote support tools, which is a high-risk tactic in unsolicited documents. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://vecsecity.info/editor_up/8969159697.pdf In PDF document text
    • http://nemdanangpho.com/uploads/2021-09-11/images/files/bizevowilowopirebeja.pdfIn PDF document text
    • https://conrays.ru/f/data/49153962823.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/widoxiluwuzumeruzagoz.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/sajekojorexiduk.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/fiwekutudisu.pdfIn PDF document text
    • http://gespk.com/userfiles/file/88473543795.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/16607746067.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcb3ca411---64014044399.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fd07caacccb16284696c9f1c425d4d5a/29219090734.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/nifewowuxulime.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/kibijigonuxod.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/56910961326.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/lodesunelonoxetaxok.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/birumofanojupop.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/87063491105.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/30636992737.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/notigififuzaseg.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/49876171823.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2f598885---jojopudakijosipoditijowi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc907af810---dusapasosusaxiga.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/50931255022.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/zodigapozuxazegul.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ae75d762428eca6caee7422cfcd76395/59690892368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+check+if+new+version+of+app+is+availablePDF 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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 18296 bytes
SHA-256: 8499db13e3ae95f803c951086a71a7c538d09ef4950a8b087484a1f892a44ffe
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 10984 bytes
SHA-256: d11332798fccdf967164334a98e639f23324219c71f60af4e134713251ba8a92

Open this report in the interactive analyzer, or submit your own file for analysis.