Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83e3fa9db17f810…

MALICIOUS

PDF

89.2 KB Created: 2021-07-28 00:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8032e8569ab3f9942cfbce643d7e9ebd SHA-1: 8b9fa3f959495092f8c99d1cf290a4c2bbd12a00 SHA-256: a83e3fa9db17f810e9fb0131044df0ebb999f5237a297e92637d63a4e7a6de57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites via a link farm. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/67522333371.pdf In PDF document text
    • https://aristi-trap.com/upload/users/files/wurigogekifej.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b408b94b11cea14a94fbd885a6ca665d/59234592184.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6182a0620---22275196968.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3ea73d0d---23578823687.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/88f038e23eef886cd3c3b0e1e9bb4484/12173232949.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/74243146719.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4e989461---tamesato.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6ffe1619b3f2e9e1ee2bff8c56e27503/47961741059.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608351d0b0375---tomakesosenisut.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/92320632411.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/wanijuxose.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d4e0d23973ceca22dd6ae1bde448b610/55995008493.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/vidixalutulubax.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160710163a6148---vadabanak.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/luzazejujamimelamoriga.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/tobetezawodalugaxelis.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f19b513d---barabivizomekilas.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/tonikapav.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/95155874726.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/46640711258.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/tobivokezafonokiwo.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/bixafagodakudabovexexag.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/11c5a1ad5ea0cb16fc851bbc9c3f5096/bomab.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lagitexidatizemep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+do+you+need+to+start+your+own+lawn+care+businessPDF 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://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_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 17492 bytes
SHA-256: 2171367d3aa37b740ca09406f84bf3199d330808393c422cb7a6eb2db467031b
font_01_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 10900 bytes
SHA-256: 4b34f98510a26c70209fb3ffbf851e5848423ed1f4b061429788a25b3c61e824
font_02_sfnt_off00013d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1