Malicious PDF — malware analysis report

Static analysis result for SHA-256 18504fbaee436e04…

MALICIOUS

PDF

92.1 KB Created: 2021-09-05 20:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: dfb32aa128d8a4bbe67b204e8108aee2 SHA-1: 1699fa35302e70ea2f15e7d241f0760eef58fd89 SHA-256: 18504fbaee436e04a5de467d25c60ae031867a886ea212f7f070c806faa5f487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and link farms, many pointing to compromised CMS uploads, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://huntic.ru/uplcv?utm_term=drawing+comic+book+pdf PDF link annotation
    • https://datawire.gr/files/files/tufofoz.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fafeforitomaxokaf.pdfIn PDF document text
    • http://www.polni.si/Images/files/kuxogegod.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/tipitob.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7885453f0---laraxole.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6eb4e11216e6af740e55c1d37c9f192c/tipuvuruvatuxagamatejot.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qlhucsffugl4sl2rm05avov1t4/texojewuxutifejut.pdfIn PDF document text
    • http://safetypath.net/cms_images/lolulororiloworuniv.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/47256616691.pdfIn PDF document text
    • http://amandamaitland.com/images/file/59309305520.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/88320c5b80d402bc74f4ae9c21387a7f/gumoralop.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2ebaf62b4772bad380f39e807b08a275/75369801191.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/menikesanamatabo.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/zotek.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/20891386202.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/43481672451.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/botumoxefon.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717fbcd5dab---rikigikurebagusesireb.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fuaujic06u2v9698qpial601m4/pixekukufofadab.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/40616516744.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/s74qug94v0dgpu7p3tfgod40o2/54145245592.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943f4047206---94345891986.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c53d614aeae---zakexolufabazuw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 10836 bytes
SHA-256: 049168b0ee325546f5e6832c62330ae11482388ba1b4668857b4404081027684
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 17420 bytes
SHA-256: 2b3f69304cf66f5eaaeeaeea38ea11adf5f89c35156bd3a92f6e3dbccb6d46d8
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AC 17372 bytes
SHA-256: 4015912eadfab797e26c13fcb52008d9753068ea77a13ca042525e98099983f8

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