Malicious PDF — malware analysis report

Static analysis result for SHA-256 5753271a7a7ab434…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 06:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31cb15a0b1eba2703a62eb3a12204c43 SHA-1: 53dcf8da482c020bc99ae663d3edfebd7db73238 SHA-256: 5753271a7a7ab434930a252916f6892d5d791dab010b19a441061ee8b82b5f19
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting a potential distribution or hosting mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vibrobreaker.com/files/files/xituridobuwarabuvumusaxil.pdf In PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/jotodonosatafi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/85335401046.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/merolusorofamu.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/88690437566.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/tamuwab.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tuganikijoruzuki.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/butazapekutukojimos.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/14911112813.pdfIn PDF document text
    • https://qnzar.com/files/gujebivut.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/47874696923.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/gotafogag.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wilifazoxalalivijajideko.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a55af33f---73257512632.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210912_152245.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/93222981805.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/c20aaef277f7c4aeecc79b92904c5edd/9923000630.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/4204937535.pdfIn PDF document text
    • http://afro-safari.com/upload/files/zujepuk.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/vomawuwijofusexokatanulub.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/rinifudapav.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eeae79877---33290591352.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/66890633163.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bb72de570f7d4bc56ad8eabfa630078f/xelotodom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+one+action+fighting+game+mod+apkPDF 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_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 10808 bytes
SHA-256: cfd8d3c40f07c14e2f65cf068c32a4219701d44b9b183cd83f35f8f02ac5d3a7
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 17208 bytes
SHA-256: b19396cbc1c92519ec005cc94aba31c58d1054ea716f0784591e49f3c59a934d
font_02_sfnt_off000134a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1