Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7736049acaf8610…

MALICIOUS

PDF

69.8 KB Created: 2021-06-03 08:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fc9328a0ae0504cceb61618275a4ad21 SHA-1: 2a60c2099c0122449833950590efdc557d068a19 SHA-256: c7736049acaf86102cf4f39e4eabdff1469b8b7f0d9d0ced27bcce7a95bc7406
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or redirection scheme. The embedded URLs and the nature of the link farm indicate an attempt to direct users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=bollywood+actress+rekha+family+photos PDF link annotation
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a09c5fcb032---kivaninikejedolokamufa.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f04c853de791eb5553078d89119badca/xiniminisuzoketukolexi.pdfIn PDF document text
    • https://medtek.vn/storage/file/35631546412.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/02c35cbb2e34d19dffd07226081ea9ec/72013946644.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead68e956e---kalovapuxozet.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210512023615_1544617454.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/jutunexubefile.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/53512bb4a72126568b6358a07d46bf65/vovaketotusibuvaworete.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4c0cb267---12241843872.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/45406950786.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/sofuwumabefipekemunojed.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/abf7f0f74bb8df50bcd16e02dcde4a35/49993234297.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/regonidizeperoligijaj.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9ab6fdfb1a969842590c7ad2aa7c313e/pefamasugimuwexesa.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/71098480056.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 5384 bytes
SHA-256: 89764c9c592b20f29adcf8d65779556a710acf5191dfb1e4567d44fc4800fe56
font_01_sfnt_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 10468 bytes
SHA-256: b23360f4b61af221504b42cedf7bfae1e28695e33d3b19ebd348261928b43007
font_02_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3