Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5526ac1c3d4d3f6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 07:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4b0f24bbba7b899bca78d72d68984d5 SHA-1: c7693ed0737e5108813eb18e00c5847dde1f022a SHA-256: e5526ac1c3d4d3f6a41aa62106c90a56267b1be4c194938a833e665018eb0cb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or malicious content. The presence of external URIs and link farms on disposable hosting suggests an attempt to distribute malware or conduct phishing attacks. Although no scripts were explicitly extracted, the nature of the links and the overall structure point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=chess+master+king+mod+apk PDF link annotation
    • http://rbtyutj01.com/userfiles/files/4703706539.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/divajupulaxekepabukoxe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329ae817c42---67093737065.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/sotetajurufadawosezavas.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddaccac3a---8974387648.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6ac35271b2b5b97405df7fa844451396/dodebijesedofad.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/75866367608.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c595c62411---nefefadogolefuwesenog.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8f29f42ca37ccc8a356d36e62bd6a6c6/51146780656.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/22003069821.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-21/20210921051636655253.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/bixos.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/43695471734.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/numod.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/miburakuxoxineti.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/70388291509.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/17157467787.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a1f44c5d---gibuba.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/sokugelivukezovited.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5863f8d375b2dde99de7d1067eb3b1e9/29426999526.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d9f5540550ec6220e221ac12821fb79c/jumesipujogupavevasiba.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/72597786571.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_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 17720 bytes
SHA-256: 702d7481920b479742c4b845767610abf97a6276e5e27d19ca95b7aa54929d51
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 10916 bytes
SHA-256: c12c7e8cba24589116facb548d537e238f30cb0bfd8fae682bccbbb11aca80bd

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