Malicious PDF — malware analysis report

Static analysis result for SHA-256 887321f19a57a0d3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 12:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 859eabf7b9a10f5d953f3cd1e165573d SHA-1: 3dd01ebee961ec9684b6fb97edf81a9b803604fa SHA-256: 887321f19a57a0d36921f4fd0c40db70a066f337faba11823db0499bb801f92c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many hosted on compromised or disposable domains, suggests a phishing or malware distribution scheme. The embedded JavaScript likely serves to obfuscate malicious actions or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://p-energo.ru/content/file/tamepibisazadalug.pdf In PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/naxavolomowatilanis.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/doxoxanedugokub.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/77958778721.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c980849ed7---biguwopepinetixog.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cafa1272e---6088678105.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a480dcd0885---jekofoxibisa.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b407d0c1363---32507105549.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4379c5cbdb---16920267074.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a983dd8b722---mimiwefewulez.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/zifodefebap.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/poforububiwirut.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gewuku.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210905_091626.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/jiwubuxeperom.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89fe77129---jinavuwo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a503008ac87---direkomute.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1p2if8ohj1pqr1u0i3ltdkmv4s/komomivulepatenokur.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/13471925354.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/podigelexutesigiragiwibuj.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/jaxejalixuxuxe.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/pisejibiza.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/41075631064.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/613124e95b5ca81b1855d2a224c5a6ab/3946874165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=apostila+tecnico+em+necropsia+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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 10760 bytes
SHA-256: 0965d0cd874eb8df1f06ca35c2f51d416bc64a90ffbe8968518255109f7ed1fc
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 19636 bytes
SHA-256: f81a39fdd8982433d42ceced81bf66b810a40c32aee75a3589a15c276e577695

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