Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb43cb54194ee0c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 19:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d917e40d1f470718b7c4fddcb394f26 SHA-1: b5d8a0bcaf49667da786ea97ea8f85c5e97ac642 SHA-256: 8bb43cb54194ee0c90ffdad42b38f4a2785fa66755936c660862ef30414673b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. These links are structured as a link farm, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • 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 http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27c80d95c---67920136858.pdf
    • https://autotronics.vn/userfiles/file/ladenabolosuravufo.pdf
    • http://driver-jazda.pl/upload/file/kumisaditufixun.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/rikakirabuvemagabezugu.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/09efe56dfd76db35cd73f3a3a6625dd9/98250423595.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f524275577f---xezinuvegebawu.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160821858eb673---tavajumubuku.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/gejutulifojisofovev.pdf
    • http://hotspot-usa.com/js/upload/files/kulijidesamoze.pdf
    • https://hbfilm.ca/resimler/files/60515636889.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078b16527ed2---51744014382.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9bafd9eceec74426411410f1460f17d3/2922500105.pdf
    • http://dellalontra.it/userfiles/files/fiwoniwumafedamagidofaje.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/096f4cf6e102b05610ddcb1446eab9dd/xonovopazogibup.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c79445ff0---tugotakoxaboluvavexas.pdf
    • http://ranaghatpchsschool.org/userfiles/file/50798877432.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/66560295982.pdf
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/91680074029.pdf
    • https://advantagelic.com/singhania/downloads/file/xisuvuvuraxelodipirip.pdf
    • https://www.ijmsir.com/ckfinder/userfiles/files/tofar.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/81086772550.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003dc139daf---femalu.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8b4591890---87391545711.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25453c5828---ribobodakimimewoxiwatebu.pdf
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/31346484579.pdf
    • https://kotata-zlin.cz/obr/clanky/file/faguwiximunotafilusul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=thematic+apperception+test+pdf+free+download
    • https://www.alamy.com/licenses-and-pricing/?v=1
    • https://www.alamy.com/stock-photo-thematic-poppercep
    • 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_off0000e8ef.bin
dc3d2516b8be6cc8f3eeaba0521fca551d29667a54e2fafbb6e7c81626683afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 19120 bytes
font_01_sfnt_off00011b1a.bin
0c8184c76047050f9a6c7ec0219f1558e4abc4b869576fd285518fc6c5954a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 10932 bytes
font_02_sfnt_off0001344c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 16792 bytes

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