Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dc2561efd44bba…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 20:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a613ea915e8f4135873d88fade88a739 SHA-1: 0872b3a7f5d9777d3fb2b4e54e4257c74f8dbde3 SHA-256: 79dc2561efd44bba836ad0f806023d14a23f1a3db32554aa2d34103a1e8f7ba7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The file's structure as a link farm is designed to lure users into clicking on potentially harmful links.

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://muratay.nl/userfiles/file/zemuliwixalobutuxave.pdf In PDF document text
    • https://deltaguvenlik.net/userfiles/file/59123105395.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/nupapoxibomibovupufi.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/gofojoda.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b17f15d3---54124061536.pdfIn PDF document text
    • http://fitviewer.biz/files/file/90211332708.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/72ea1d6a628e48ddfc9fd6c1e4d7e457/sarotijezomenag.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/sogapetox.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/palivizukapemomadizozab.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/kalozawufudofet.pdfIn PDF document text
    • http://alkanboya.com/files/file///rikujijonimonopuwapigudu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c182763e---ninokidexefukufejisegiwu.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/69704573648.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/labasebeb.pdfIn PDF document text
    • http://dytac.hk/userfiles/8119774056.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/defefoxusilizoxiwedanumo.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8346b7824728679f102834e92e59a6e4/jizajigu.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/zobukupaga.pdfIn PDF document text
    • http://df-2.de/images/daten/file/gipuxupetejuz.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/44013131257.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/rbhhm085s7m9ahsdjiehmmuuke/jeganaxe.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/67066231141.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/59444eea64833b95a3ef6785aff28373/97009401894.pdfIn PDF document text
    • https://tempegaring.com/contents//files/67569342784.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/xexujemamiwujizox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=origen+de+halloween+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_off0000c207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC207 18592 bytes
SHA-256: a84ca095e51175e149001369cd51add90909a055bb0a52e4ca76276ea7ef43f1
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 10624 bytes
SHA-256: 31899b2ed3a3ceb510d7f318b739aab98b25dfb77d572f04185389947551b80d

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