Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dae427104adf22…

MALICIOUS

PDF

82.7 KB Created: 2021-08-24 11:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86a941144ef3a58ad59117128a29e133 SHA-1: 6c063a9a4c4273bb591eebd15047a57730c0907d SHA-256: 20dae427104adf228dd26b601bedd2e66aa83e86ae62bc128719289b7dfc7f67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download or execute malicious payloads. Additionally, the document features a link farm that points to multiple external URLs, some hosted on potentially compromised WordPress sites. These elements strongly indicate a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://w-w.cn/isee/pfm/cms/uploadfile/fck/file/20277970837.pdf In PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/fusupogofujobobinatulog.pdfIn PDF document text
    • https://abeess.com/userfiles/file/63085346187.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/pazotejebaromejovufax.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/nawapef.pdfIn PDF document text
    • http://teplospectr.ru/images/files/fabaru.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/fopixavamiluvokoz.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/9384137069.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/kogoxekewobup.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0cf2c46f8582f4f5b5bfdbc4889b25dd/bafalodu.pdfIn PDF document text
    • http://darec.sk/files/files/3222203045.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/nilirid.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc35af018b---51206765373.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/fc45059689093e12f38b58db222f3525/jobakepogodatalul.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/puzanijetebixinurebij.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a708431e46.pdfIn PDF document text
    • https://ewt.cz/res/file/11560952691.pdfIn PDF document text
    • http://sparkpro.lv/content/file/wubiresisan.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7017168c---56955778389.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4d9e356d867073dc3613fa270fecac96/70755588071.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/95567237094.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0f7609ac8a0f326749f4f6b1b2586a81/kuwaf.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/62866350559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=complete+the+taskPDF 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_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 17156 bytes
SHA-256: 471a449b84262dd97d616f5d46d0ba721ee829c9ea7c647ba5a76915927e17dc
font_02_sfnt_off00012507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 10344 bytes
SHA-256: 03411d74868c1b5bbccb3b16dd898f30f31f6aba7ac14e4362b014fd6aeeeebb

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