Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb907eb2182ef60…

MALICIOUS

PDF

87.4 KB Created: 2021-08-07 11:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 410982dc4151de7b700bcaa5e36bd690 SHA-1: b1d98f19d5c4382cba79829b5ea4bfdb2758295c SHA-256: 8fb907eb2182ef60f9f0fecedee6ac7b759e12e09041e124276099eadfb8c1df
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs, many pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://casavacanzesanvito.eu/userfiles/files/rasazupusedan.pdf In PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/pixiwis.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/25170351354.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/pugusijogunuwurawilef.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/esq3pcdkueuur1rapn172t0343/44648179184.pdfIn PDF document text
    • http://soles2walk.cz/data/file/53636648967.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9jcp3to5a4raacv4gpla0loup6/dimilifizivopusawelamizaj.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/4672417737.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/jafofusavafudinap.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105910d60ceb---17536014391.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2e81fc43dce3b00d58cce41dccd3f527/jivaritanubiba.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f9b7616159f463d67ff17d1b7e435588/lipuxidim.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/xujimaganagedis.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/misukenegezasusubi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e796ec362c4---97027669572.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/85337417589.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/luxonevusaleka.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/74233440608.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/c84c8efa70c846facbc7127f40051d5b/katumogilex.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/67634554987.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/53581104681.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210617151349.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fd9436fb---17124921063.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff1307fe6496e5e3b674f0b5b25d66a2/66924178512.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/lemimapuxelewamegun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+troubleshoot+electrical+circuitsPDF link annotation
    • 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://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_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 17712 bytes
SHA-256: c3065fba39b9805d7367665316520f12f25c8ca4c6d7bdf3cc0049ccd1a1cc81
font_02_sfnt_off00013a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8E 10540 bytes
SHA-256: 8e88780cb26d2fabc739b14c4ba8e9d0acdde9b345294fef3c4c00c1dfbbecf2