Malicious PDF — malware analysis report

Static analysis result for SHA-256 742d7ca22f6cd445…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 07:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d13c7627ce6b1cab39189207fdd9735 SHA-1: 765eaa1b44e3ca7caebcfc3a26e4a82543c38c46 SHA-256: 742d7ca22f6cd4453c8944d8c48bcb926c7f03250359652c4b1dc2921936a52f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://perfekttorun.pl/pliki/77855441353.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b20223d1008---tizuzusapixufuwupetu.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/suwejobedowadiwozinelelaw.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78e9a9c0e9---19901652485.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/rezokujex.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/57018335515.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/9751695381.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71e60c214---mofisew.pdfIn PDF document text
    • http://fotossc.pl/_files/file/ruwifiwunuwenofemarobinuk.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cb5dd8465---gibafo.pdfIn PDF document text
    • http://aps-mes.com/files/file/tarivaxujimafujimizaluv.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ee5264a09baa37a8e671263605c8210e/rokimamog.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/bonewimizovuxek.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/remukumajid.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/44623662975.pdfIn PDF document text
    • https://unosms.us/userfiles/file/14832055296.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/ruwabawubuta.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/93878460444.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f052da96---89450310326.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/26393218968.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/neworekojukumomafo.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/jai8j9rktt1nnhmivmeq6psb52/tuvuxidokesogo.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/najulibezefifotosisutate.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/50717359308.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/79536652241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nissan+micra+2010+service+manualPDF 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_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 10608 bytes
SHA-256: aa3a2e0d3350bb7173ca0a6e848b0cfd93ae660bdbddc046ad408760d8ddefc6
font_01_sfnt_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 17552 bytes
SHA-256: 7f6567d96d16be3730fd7c4e4130615a455f624b342e0b939c9dc8629b27e058

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