Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae182382b3e82dfb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 01:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb4ce230ce83386a4506a070299d7623 SHA-1: df7c9c11ebba3994d90738f93505082e6c27cfcf SHA-256: ae182382b3e82dfb32e3f441fb1f50dc2d8b57e59b1c4cc3703d02d799a5dd71
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 a large number of external links, many pointing to compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fdead75db---jejuxasekoxojot.pdf In PDF document text
    • http://thebookmarkcafe.com/uploads/files/89096373198.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/lanekatiraf.pdfIn PDF document text
    • https://digireg.dk/upload/lijizefijejuj.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5cd8e95d13656a6af22a203b56aa38ca/mizetazativipobu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d5e387c8f6a507efc047bc51313bceec/40688911300.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/jajoxinuvofafijisukufasex.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607400d68f053---dobase.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/geluvidubex.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/fiponadegepiwuriben.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739dc95a1e9---56497657449.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/tadosojisesuda.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/suwiza.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s0o82kfvd0tg88ih6aci1k4292/redotetujakusepuxexu.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/sakuliguwak.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/putitefepeg.pdfIn PDF document text
    • http://ashioke.com/images/library/File/mafipalamalubiluguzatano.pdfIn PDF document text
    • http://wirheiraten.de/images/file/niwajudorepavibirubiwomot.pdfIn PDF document text
    • https://vzglavniki.net/data/file/35631638394.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160995fa7c8297---gijeranotefuwosux.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/lupiwife.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105394c0d652---99376629873.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/27272603855.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607deeecb2bd3---76608065342.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/lenonabomokuduzude.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/guvilijid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sunset+limited+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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 10452 bytes
SHA-256: 8bbd9fb4b2ec136cc047a53cd8c8fa2ad8f3c2acef9a457a4a70c851fc3a5c60
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 20788 bytes
SHA-256: 1dab8f2312deb07863d7659dcd335aaa54a416627223fb389d61e961347c075f
font_02_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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