Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a087b4ceaef02e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 07:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b53d6300afe5f7ecf4e54807d2b920db SHA-1: 4b5b5d2fc4a3f7531863306faaa2416e1218715e SHA-256: c8a087b4ceaef02e5389dff6e8a89dff4634a184cb5b241ab96250327a2b549c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, distributing numerous links to compromised websites and potentially malicious PDF files, likely to lure users into downloading further malware or submitting sensitive information. The presence of external URIs and links to compromised CMS uploads strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=grey+spotted+wiener+dog PDF link annotation
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/9a8cdefb544c99c8c21ad9c752650a49/pepemavebazax.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/megalujexejato.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/padupafiwadodewebu.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/13602459623.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/14133856940.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/fcf85bb525dd9914298382ab6883eee0/78789906423.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a9d8b460cd6bfa852e01abe3e2701ea/dinegosudirupobazobinud.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/zepuwet.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/81560812453.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/70erev85d1bn3bu5ttf958pd64/jelugenadafi.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/zadumugexitebubewiwepa.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c550c710cd1---gopagedazugokovemunibi.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7107ff5bf2a8fa144fe2f98ba93346cf/10961010480.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c430091c78be520132f60f918757fa57/81307874090.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/apoqbr3het8fo2fbeb8iaack72/89774792672.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607546d049a55---nulokixigagozaban.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/rivarafujixodosoximuliwu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f215074666a5bbbcba2fc1a25c352dc1/wemav.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/dinekewumevijetakewowogo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607355d8dddda---15266646102.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb32c3e7d7---lezokuvexowu.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/kavupivokiko.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/35340397614.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610490930a0ce---rapomo.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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 17164 bytes
SHA-256: 6fd9ed99daa9497786296d439cb4a55cf654f6d989d43726f2f374d40ee9cb72
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 10596 bytes
SHA-256: db16ebb37bd44dd1b49eaedad6c3335bdbf3d712f2cee7f2e51e21fa5da66039

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