Malicious PDF — malware analysis report

Static analysis result for SHA-256 84336b950c106976…

MALICIOUS

PDF

81.7 KB Created: 2021-07-20 17:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53aac2819ed20bce73170e425464cb41 SHA-1: a267595c5d3718dc24dce4b94dac7943ba5fd0c2 SHA-256: 84336b950c1069762e678f997ed8c126194bba3e2c4ae0f43c9fa61893cff164
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The embedded JavaScript likely serves to redirect the user to one of these malicious URLs, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://uppersanduskyrotary.com/cms/files/File/65040770101.pdf In PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dutubifamopiperebefudulo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/76208d5a08227d23a6a5086ae9f3b982/77194950344.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/65570571603.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/be0cff3f2675ceeff4cd3318fb888886/podavugonilokotisasajiva.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb685f33b49---67153082797.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16081c8fec495d---83943472232.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815028d5bad---5701914762.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f2e424d10173579a3077d4842b700c0/45950249199.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/33636558609.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/bewidujatigapewivataz.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/duboxigu.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/wovevepovemedu.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/wovap.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d35844a6160---84313546049.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/77661549962.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/19493678289.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/butupiluba.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/jufagodifixawumefugesafum.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8583934fa---51049632498.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55b8e85a2---84908919470.pdfIn PDF document text
    • https://angkalaris.com/contents//files/werupuvosunibovakanaxiwal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=business+plan+for+dummies+free+pdfPDF 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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 17128 bytes
SHA-256: 9ed92c38d7ef6590e28e62f82ffa6e219eb41eb984fc29ca26f9a1af3479fc2b
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10716 bytes
SHA-256: 29954f3689fc2ec24a6d1deaff2a49462c5bd338c483ea3b673f561b98df2f6a
font_02_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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