Malicious PDF — malware analysis report

Static analysis result for SHA-256 75555a4a009728b0…

MALICIOUS

PDF

99.0 KB Created: 2021-07-13 20:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e30cd96a457ee1cbb90124360b878d3b SHA-1: c390e5933646c1b770779f8af5109a821beff587 SHA-256: 75555a4a009728b0a646b51a1d66387520598bb9be4cad01e6654dfe9a190afc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various websites, many of which appear to be compromised CMS installations. The presence of multiple links to potentially malicious content suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tls987b3vrj3ovc8lktpbksfp1/jesodilevezugogod.pdf In PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/fbllbj7cb0mgaspg78l34rqnoc/jadujozosage.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c564137e5---60994140326.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ibbeh4eftpis54130bi0bj4qjo/siwomijomimifozudipo.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/88956955049.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8eaf05149a60114d131bed2ff4e030e6/bogoreligofitumalunagol.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/33595456807.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/35362598132.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/51649552458.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/15799001328.pdfIn PDF document text
    • http://prmakeup.com/Image/files/39296842594.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d03b1d197---33968006942.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f3ef2d3c69c4ba2d84484678f146d77f/dilibuxit.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/329f042777bfcf6141631c1003307e46/88824382144.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784df39ef26---tolakunole.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/5570681605.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5424d37da---73056055308.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b4196b97---49672238142.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1ad27904---xesapiwumujidazitijitedar.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2l7uunejl2cortjecchki340ip/dazalokabonaluzefaleri.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38eb624760---17970042298.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/38838636549.pdfIn PDF document text
    • https://studiorampinelli.com/file/wufodivajemikofe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/i0ilrpk4c0ttrmnsr584ubqf00/balekixumanibubuwamad.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b94cd3dc3---89291418136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=beers+for+black+and+tanPDF 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_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 20528 bytes
SHA-256: e4e3331ce2cd7166ea2f4d3a3e22afd683b87277b8b6f37e283572ff0f069c88
font_01_sfnt_off00014e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001664f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1664F 10664 bytes
SHA-256: 2460a2407164360d7cda8d520869ef6aaad126ec1c866f156b85adea54999615

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