Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9e8abe17041003…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 17:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 02aeb542b3319a3c2f84128e56ff9ee0 SHA-1: 28729ada470a8945fd5de84152c4c2d60c0c7a57 SHA-256: da9e8abe170410035ea6faa9de92c5e0741e6af34f903a16ac1303f60215db11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://ph2020.org/FCKeditor/file/nawesafusej.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/161f4983d2c4db95026729977f47c673/12669513017.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/696ksfrgir5abb4vsi2hf034gc/38907516596.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/87902059750.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/42276249093.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/doriv.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/dubafixupukeduvutofinoriw.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/jugidozixuve.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/40440113336.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/14c933fc1aa834ef2a6bcc7dc67f70a6/vipuvetijagovorikune.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/goboburexidijiruminoxewuj.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/nukebazituzupatotibot.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609289d5db549---88719869255.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/safitatekevedapakiwavotez.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/getogov.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/setivasofakatedaxov.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/sns52aeseubo62t667dpr45dp9/37957310756.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/aa5aqmt1q6g9qq2lk3dtblhh8e/33523030676.pdfIn PDF document text
    • http://boldogelet.hu/media/fimurarudezoz.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/97087280855.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55eedc856---logozenigaxorivovoboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=physics+investigatory+project+for+class+12+on+transformer+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_off0000bf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF65 11552 bytes
SHA-256: ce4a28cdf8a626c0e6b712546a4f2cb1ccaf3b2cbac4b05ce26ee797239fee29
font_01_sfnt_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 17172 bytes
SHA-256: 738058e9497d1257ec2f7360c22a418865b488e53a151bebfe15e4ce35dd2ae4
font_02_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1