Malicious PDF — malware analysis report

Static analysis result for SHA-256 456d76524150319d…

MALICIOUS

PDF

87.9 KB Created: 2021-08-07 15:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8b5297713e24b824776b30b2e1788be SHA-1: 82eca70b0eab2f4e4d706c4711f1e404a663ab0f SHA-256: 456d76524150319de009e0fb7d7342ed1d01256e59ab7d719e760f5b3c0cc9e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=escuela+central+de+artes+visuales+san+juan PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae750195a---64959781548.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/degiropibibuberijukiwi.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/zibazebudilozuzuvunite.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/nomikonizukijunadeb.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/74047570526.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3046476764---gerugogim.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/xoburorijupu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/zagibemezegak.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84af695a48---81496355248.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/baferujipubanabipirir.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/26417696741.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/99dac630b89d8d37244d666bf0ea1c92/27511298743.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/88c9b100d499ede7e62785911dc79df8/4222000774.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e32aff8d44a3df4207b415f07e86d7b7/binosetadij.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/bojaku.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/10396786465.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/51151101306.pdfIn PDF document text
    • http://rayanchem.com/d/files/21034241979.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/90875542885.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/zifutizojur.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ef5c2d64959426aef016dbe069cb2bd9/49064369045.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/tonukapuxowizixubo.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/notanibagujoxuzawefedo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2266aa84---wevinudonabixut.pdfIn PDF document text
    • 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_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 18468 bytes
SHA-256: 293324be298ae6270e9b9d509633cb3973be547d92dd38867baf8899f5accc28
font_01_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 10524 bytes
SHA-256: b014ef669eb5de43466c52963f6d94668dc7f92832602f3ffbc028ad0d843961

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