Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed8c1da5fa727f0…

MALICIOUS

PDF

76.7 KB Created: 2021-06-09 07:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 688ae701ae260cf88c4c4cf67317a9d5 SHA-1: 5dd5c635743b9e4f9e21a0f1c2e555ed1d3007f6 SHA-256: 2ed8c1da5fa727f0c42285ed9aa0722d01e058105a9acd55fd72850e6281cb75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=calculating+molar+mass+worksheet PDF link annotation
    • http://simonide.org/userfiles/file/gimoligusojesiwudil.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcf613da6---71911820374.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c2beb042---dinixagevidokepabiz.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/78347234205.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9lpggs187dbv2l2t5iq4h0an5h/mivigolelivet.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdea4105c4---zazawu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/a506qitn92ntlomb93e5a62kg1/67735767907.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/i2t50juv2k4eneucdhdjhlc5sa/90859395004.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/af7c20663cce6a300798b4947381950a/fazesatowebijiduselu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891fecb8a0---kogojoxodir.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tid9kmm7u1th04vkjtipnriic6/77405788461.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/vlbjkk6om2r7amgu5bug46rnhk/80947302383.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/07cc9fdf0dbeb5b74d37c9b053c84643/95753822391.pdfIn PDF document text
    • https://banghenails.com/upload/file/30263727446.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa531c4dceb---magovukiligog.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/mupemilixe.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nofu6dqh9kbqlhk8umj43h6adb/jegoriga.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/towekigiforosado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 5272 bytes
SHA-256: c235420bee3e9a429373cbdb397312f3a3ce00206f4d99feaa300f98fcf80eaa
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 10800 bytes
SHA-256: 4005bb410961e92e48087b0eb78d1c17ee959f8513eb42f2f6709103bf96ec50