Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c39c03372a9d94…

MALICIOUS

PDF

82.1 KB Created: 2021-08-21 00:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e29d5570962317eba2237a228519a0d SHA-1: 9578e269990bf6eed9f0eaf6b6a5f79a1a019e6f SHA-256: 88c39c03372a9d949a6f9ded4b26210e2ae910a981317d1f6262d5ff4ce7e567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point to a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://bigbazar.cz/is/images/FCKeditor/File/nabotoziwoberatava.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2c9240a2914c54d2d027e8b5acb05efb/69777646979.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/45241049586.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/xixejegamevediw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d8ae670097b84224b17d9a924a106f03/suzoxe.pdfIn PDF document text
    • http://atya.eu/files/file/fasokufidela.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160da604d451f1---momibosawozofuguxugoro.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/furobadanasopik.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ed0a93220eaf9ff3b428aade8adbec31/91002939141.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/ralefabagavobib.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/lu8q28id46culdbs8sb0faua8m/83360794880.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/rigebomolesomesofuv.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/miwiv.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///xuzigerosewajodatuwelit.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/75528221266.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5204eb844e9cf0b680556cd0119f3753/sumixosefekobiwofil.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/98603752696.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/23557217290.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a0dc00d68---jaxuvomerabegufoxozopeje.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/99632845805.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/f1364d8889c1c8c55cf94cbc08e90b55/213870089.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e0621c31cd4a173eb8f1c82de4ce4aa4/21905611318.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/84992482707.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/jidodajagavojukubiduraba.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b4c37e954f923be381b13645e8954c2d/63487388252.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/o9h1uac776blcfqdd4vg4lkkh7/nekofimidikerev.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/27385148345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=why+were+75+books+removed+from+the+biblePDF 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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 11028 bytes
SHA-256: 69e77c4f723381c082ff9a79715403d10676739bebc867fbac2214f9471bd6a3
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 17068 bytes
SHA-256: d297ae5997d4f32aa53be5791f3ea9aa86c9a4e85354a6fc306cd86ae6a2b735

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