Malicious PDF — malware analysis report

Static analysis result for SHA-256 6753b55b9efb58e6…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 01:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f08ab73004630c9dd4666417870cb690 SHA-1: 2880c288ef56d7204ea89262736d2a37139603b4 SHA-256: 6753b55b9efb58e60dddf0302c557e0279d1b0c2ddddf039233e9cfee56c0725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ludifrance.fr/userfiles/file/87352135072.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/274c1492721ff865c5c63ae8f90bedd7/90830369590.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da293caa5---wirobozabalafaraf.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/valr6mcmj28lvsk0vp7sggp6kr/28073942749.pdf
    • http://cdmatik.com/uploads/file/21420370407.pdf
    • http://bualuang101.com/backoffice/upload/files/kawiwokuj.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb83454fa23---82737641545.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3rvpo9ss7dms7s0ru3r1gun4l3/gexokikefuxasir.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/aba09e976491817fe81938ae83a68531/77913525583.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb684824e---55438291081.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e6f4e734f---tanotowokitoso.pdf
    • http://talleresjpg.es/img/file/sawaromegix.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/72fe7385076b3b911aa0af0ac4a260dd/98808423174.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261ab23779---16690066501.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/86254018742.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b076ad291b82233de95bf18e403d79d8/tizemamugiv.pdf
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/wemuxebazuvomi.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e923e3c33---kivobudubalalerobeb.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/lemadija.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sjo8tjhrb0a5n53u6o55t28v7i/dikapupawumatufo.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/9b5795e175f323ee832fcde7dca4cc9c/95242132327.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/75595940145.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607114d4d8403---37184714435.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3fa6bb43e9b5be7f809ceaf6be8169c4/wasexijesobulufawagamef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+diary+of+anne+frank+1959+full+movie+123movies
    • 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_off0000f216.bin
903b6ee03ae268a03a877fac324f49a74a8b8229fc60f67b56f594320c27ae71
pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 11504 bytes
font_01_sfnt_off00010d4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 16792 bytes
font_02_sfnt_off0001255c.bin
e37bcb804168b036500108d1f2160073ca747f62461d96a56577ce8cfcc38413
pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 17468 bytes