Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccfab174586e381…

MALICIOUS

PDF

91.6 KB Created: 2021-07-22 05:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cafcfa9e2fc96d3f9e3cb58bd22f1b03 SHA-1: 35a2266b3f778de6ee8493c3510d57bcc7e37b6d SHA-256: 5ccfab174586e3816b9661859bbf4fb6decdc2d218dd3e96b67598bf28634005
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malware or phish users. The presence of multiple external URIs and a link farm heuristic strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mcdpiti.com/userfiles/files/2138053829.pdf In PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/4f1448d9b31fe410484a11680b97e510/rikutopoju.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/37381830440.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021050918305473499.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8bc02e880dcfcafb08f488b6b8fcb1b8/tubiligejibisuvi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/fuzixok.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/kuxomurikimojosimo.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/35669915734.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/68a96625982e19aef8d6101fbce53b2a/guluzijotigu.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/66162884053.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8d8555ae---tebigado.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3919003c---raleborigefojuxewibi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a526ce1eda7579622851973a29b39dc9/denukalefe.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c485cfe0615---65300748155.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/46528400617.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/nidazunonifo.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210610014610.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8d57571e---golutebinob.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/kisanavomev.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/3501420566.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f1dc46e16945fc81b37b160ee252d851/44110446135.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/89770343747.pdfIn PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/kesurumewux.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/92ea9e01b0ca676bb1c1c310a5c83c81/86425934217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=is+it+illegal+to+date+a+14+year+old+when+your+17PDF 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_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 17276 bytes
SHA-256: abf59147250b5388f571fc3b68b9288135927e5075d22cb233142c23384861e0
font_01_sfnt_off00012daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAF 10956 bytes
SHA-256: 74da7dad4dfe1a13b4c976c8b89cf825e1da9451223f0d8a0f00041d4fb4e593
font_02_sfnt_off00014705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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