Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da8efcfc49fc414…

MALICIOUS

PDF

88.9 KB Created: 2021-08-24 03:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93798389a2fbd3edf5e35abfa75e76b8 SHA-1: cbfc74c32778d91e7218b3c38ec4316698bd79de SHA-256: 1da8efcfc49fc414c9b8af0fa56f0888679ddf0578c4a5199434aa54f4b822ee
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. The presence of a QR code lure further indicates an intent to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd2717b41---33776281678.pdf
    • http://sclifeguards.com/clients/16854/File/46383357187.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fn5r87rdfkuvlsqm26fgtn1453/56501575863.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/38666404737.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2eb865ff58---vuretafotelusotef.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1609c389d---98644448721.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/74617455b9ad6924c655f8dcfe627860/48787753603.pdf
    • http://amphorabeautyclub.com/campannas/file/menowaveragejaki.pdf
    • https://atl-50.com/files/file/67834009458.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2109c8c8cd1eacd360b469af5c289711/kovunufirapagejudevul.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a096782d7---xuxazeni.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160869fb648fdf---67003362560.pdf
    • http://narcisse.sk/editor_uploads/files/sidupokejexoperemadipej.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aef090775---nisoremafigapugowizokupo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2b9059b51ddc466dc760b2a3e77b5bc5/6297739202.pdf
    • http://geotersrl.it/file/30311731554.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41fad00ec---betidetipin.pdf
    • https://kildevangen.dk/files/lajikadotabodev.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a9eead232---11604909065.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8rdq20u5de8ppklk7ceuj64is5/xexabir.pdf
    • https://next-engineering.com/userfiles/files/76477735703.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/82052423258.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2a0509c87---58658849463.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+transfer+pdf+from+iphone+to+pc+without+itunes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16792 bytes
font_01_sfnt_off00010ae7.bin
cde2f2bc92928043cef3f8369837763ab70b0ab2308ac632d59c7a3a29813579
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 18928 bytes
font_02_sfnt_off00013b61.bin
bb83edb30da35c279c09db112850544fa7216aa9e6a8af490eeed37f956bbb03
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 11016 bytes