Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d6c3917e21e26f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 11:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1346f934c15e9dd4ae8022cc1a07ddb0 SHA-1: b9d07d0d1e8cab955609452644da2e9d0cabc2c1 SHA-256: 93d6c3917e21e26f43f02f51cc834453010cefccb84f3fca39d487bb8212c107
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://garglob.ru/uplcv?utm_term=boruto+naruto+next+generation+english+dub PDF link annotation
    • http://poorclarescork.ie/images/wuzisumimexa.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/58066647723.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/wibidajuz.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/35487379968.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/78857290073.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210928141054.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1fba262def20529fa85f5ac3a7da63e4/mevemulexojam.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/14619085475.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/92378458157.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/logovojikupebomobopiz.pdfIn PDF document text
    • http://sadrokartonyhk.cz/images/fckfiles/file/letokemo.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/loxuno.pdfIn PDF document text
    • http://ban-dong-ban-mat.theonejsc.com/userfiles/file/92123104996.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109152350523889.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/lilebamivenefefibi.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/futezubofe.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lolejuzunafulilopujumujam.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/jolatalesilidigemek.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de690ec44d---19560706083.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/35671063688.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/70570043116.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/19815021306.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef527b62b---jedugakeno.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/sarorebubetog.pdfIn PDF document text
    • 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_off0000b25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25E 10924 bytes
SHA-256: 5c04631e9ad1d04f5aff0e54b7427d2224da03650f786b3cd28093605fa635cc
font_01_sfnt_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 16616 bytes
SHA-256: ed876847ea4bf11ab0561f8a57c53d5f13398410e868d9cf89e3e78c4c960fb1
font_02_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1