Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f240dc2e8a94386…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 04:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d43a4bc2562e00bcbc1f9e445574e194 SHA-1: f976556b58c0c230f203e718e0752c5f1c03d971 SHA-256: 4f240dc2e8a943864f204f013bb686614871e9c30ad447a53cc7a14bdd4ab822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the nature of the detected heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://landpas.pl/upload/file/lexavanuwuzikemasewo.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5dd52075c57b6eab4b3fe5bc760ab859/28178111614.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c1e3a5ac0c89d72271ba2bf5cebd2116/sijamaraw.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e64389762d9---26765188751.pdf
    • https://master-service.ro/images/file/477158614.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba1412f85---66155872486.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f99fc97b4---42390344796.pdf
    • http://nhatngungoisaoxanh.com/upload/files/34163472738.pdf
    • http://adbuffalony.com/uploads/files/49891286775.pdf
    • https://aprilboya.com/userfiles/file/45987607041.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/81365385a0b58d40cd96c08b4cefe9eb/tedazipebamixim.pdf
    • https://fullgame.hu/uploads/files/86610006781.pdf
    • http://lukasikgroup.pl/Image/files/naroxevadageketatiw.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/21371574580.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76a38cb32---26342857687.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/0vjc8i46anad305sa7obnf028o/48862538283.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bbl0u4tv9o7lsfkmoh3o2bjggu/20947270496.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e1d8b1e9---fajikixegebuzelosebutop.pdf
    • http://bularz-auto.pl/images/userfiles/file/jaxemal.pdf
    • http://mateuszkucharski.pl/admin/file/gimuwofojofupumubejura.pdf
    • http://sellmysayarah.com/userfiles/files/buvemi.pdf
    • https://deepankarbasu.com/FCKeditor/file/47340009300.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/67341ba8ae37501111e03d542a3c87ed/gonadupalisuvakakelapub.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/000eaece66eee9e548d49f77211c09a4/zikeroweke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sexual+desire+disorder+male
    • 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_off0000eacf.bin
a81f12d3abd22f71436f64642cfc45975620ad83a7c575f7032dd1afd3e96095
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 17588 bytes
font_01_sfnt_off00011914.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 16792 bytes
font_02_sfnt_off0001312b.bin
744c4681d15e4c6f6275cc45cae0937ba47d2484c733664248d132251a4f6fcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 10484 bytes