Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7bf6d5f2fbf0ae…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 11:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 39ea68c597575bbe1a11b5b24ff0431b SHA-1: d39382c450cddc6edbc83c83d09e4a8f491cf038 SHA-256: ad7bf6d5f2fbf0ae7f7296e8ca3049b0c3957636d72bdd046e802d41d07c55ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple unknown URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://sity-luxe.ru/userfiles/file/48766830242.pdf In PDF document text
    • https://wecareprogram.org/images/file/21206179756.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/vurox.pdfIn PDF document text
    • http://carbontuning.ru/file/77865464499.pdfIn PDF document text
    • http://e-district.org/userfiles/file/64373132294.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/16627685167.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d077833c7158072a8d28f702a3fb451a/4012983150.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/xijuxinekoxujivusowepewod.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/6582106583.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/mazoriwunejevejele.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/bepibepukexedilomarebud.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/zitew.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210912_165722_2014.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/82237228322.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/88148400720.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/gopanokaverexewem.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c693df1e204c904e8bc79e2a0b4f5887/71963354163.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109050514215474.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/vuzeva.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/45608539294.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613679740feca---84560848290.pdfIn PDF document text
    • https://baongochoa.com/upload/file/rivilaporikevevuj.pdfIn PDF document text
    • https://ghnservizi.com/file/24470964647.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/koxadaberaxamiteru.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/xepivozuja.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/17637286293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+hidden+oracle+free+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_off0000b562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB562 10412 bytes
SHA-256: b49e7cd3f54b153ce83c7390e23cd5c111cfc8bb7432c5c1311a894e9082a3eb
font_01_sfnt_off0000ccd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 16356 bytes
SHA-256: 84ad9c33410a23c10e14af95eb986cb4eef11e38cde3695a151668c0085ad48a

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