Malicious PDF — malware analysis report

Static analysis result for SHA-256 347ab64ccc29a700…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 15:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 453814bc1f07573147d3b1bf55f0743a SHA-1: fb7aec51647913ada2bf790c1ba8aacb20d4605a SHA-256: 347ab64ccc29a7009072bc39b0b3c7f221907073a666528a39edad9dd4c478ea
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites and disposable domains, suggesting an attempt to host and distribute a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=forestry+lecture+notes+pdf PDF link annotation
    • http://asbu.net/uploads/FCK_files/file/xamev.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d392afea1---10762126276.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/zekeworumorejax.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609583a0d5ab5---61805310257.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///fiwapisuwimomazoru.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/pl27276238un1tooidueso73a6/sesuduke.pdfIn PDF document text
    • https://manenshop.com/upload/files/95992307571.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/siwufumevixusavapogovefa.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/dupowexawis.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pii9ev8gqdh83tum1h1nairos5/1475981936.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb82e99df5---bifafetek.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/zujetogodigatumosiv.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/xawoleko.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/fuvarujavufafikemasodig.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a2aadc04f112b0e0e3fd1f1ea059085f/98461204774.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/48367353059.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nozot.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607739baf098b---garezugedijusasekimu.pdfIn PDF document text
    • http://chromatographvials.com/d/files/33711536074.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf78faca4e---lodesajurev.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9032b2bdf---kisorowud.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b3a58e89---demaxafepat.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb3e6853d---23245057074.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/bejufudorasanimetof.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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 17972 bytes
SHA-256: 87a7a44141bf8c0c6a7749b5359cc2d83ca2ee3e3114a54b3eb9add180940f49
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 10552 bytes
SHA-256: 0e224539204f64560bd983b3d8c74d385211a190b0a214fccd12a0057bc778b6

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