Malicious PDF — malware analysis report

Static analysis result for SHA-256 731e48db5ce3f190…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 18:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 172d650438feecb05e191b2413fc9cf5 SHA-1: 01c5544bec9561560d4dcd011afe83e610cefd9a SHA-256: 731e48db5ce3f1908c2c995f02a28030b2196dc127f08b48a7d4c6312201affa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://adetexfoamgroup.centralcms.cloud/galeria/files/76410433623.pdf In PDF document text
    • https://borgopitti.it/userfiles/file/4711851744.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/zularodoseduzovazira.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/62519348984.pdfIn PDF document text
    • https://aedwea.com/upload/foto/rovinemixenuxip.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/danuzasakikoseluxuzeweb.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/tatolufo.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/foziwelumenemobadew.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/70188088989.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9864c6b5---60794234931.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/kinebogoxedizekobopog.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/padakusexananu.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zigugigajereputonate.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1bkvf6kmpsjji76178b8qa357k/2567525994.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/bifonodafaluwiwovora.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a912012ad7---28966878518.pdfIn PDF document text
    • http://elma1.ru/!upload/files/ribedibufekumarigunitaw.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/16272333451.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/terigivufebez.pdfIn PDF document text
    • http://zamgph.com/uploads/file/040948057569.pdfIn PDF document text
    • https://parkettworld.com/upload/files/guvawob.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0ebeb082d6da9acbff74016665a9f7a9/12675225472.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a694dcf2ea---seladitixemadem.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/goravopizubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+demographic+cliff+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_off0000bbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEA 10660 bytes
SHA-256: be70abf02e1a35c5e553bf3f7f0bd8e20cb64d120e0b4a920fb083019f99cc9a
font_01_sfnt_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 15852 bytes
SHA-256: 83c9d369dd13ee7a83a028482b81400e82dee9a0510423bb0c10a33a43cbba99

Open this report in the interactive analyzer, or submit your own file for analysis.